Search IntMath
Close

# Congruent Angles in Geometry

In geometry, two angles are said to be congruent if they have the same measure. In other words, congruent angles are angles that have equal degrees. For example, a 45-degree angle is congruent to a 45-degree angle. A 90-degree angle is also congruent to a 90-degree angle.

There are a few different ways to show that two angles are congruent. The most common way is to use the symbol "=", like this: Angle A = Angle B. Another way to show that two angles are congruent is to use the symbol "≅", like this: Angle A ≅ Angle B.

Sometimes, you'll see both symbols used together, like this: Angle A = Angle B ≅ Angle C. This just means that all three of those angles are congruent with each other.

Why do we care about congruent angles? Well, they pop up all over the place in geometry, so it's good to be able to identify them when you see them. For example, when two lines intersect, they form four angles. These four angles will always be split up into two pairs of congruent angles.

another place you often see congruent angles is with triangles. There are actually three different types of triangle congrunence - ASA, SAS, and SSS - which we won't get into here. Just know that if you have two triangles that satisfy any of those criteria, then you know that all of their corresponding angles are going to be congruent.

Lastly, anytime you have parallel lines with a transversal (a line that intersects both of the parallel lines), you're going to have a bunch of special angle relationships that involve some combination of acute, obtuse, and right angles - along with some pairs of congruent angles thrown in there for good measure. So being able to identify and work with congruent angles is definitely a skill worth learning!

In geometry, two angles are considered congruent if they have the same measure - i.e. if they contain equal degrees. You can usually tell if two angles are congruent by looking for the symbols "=", "≅", or "<=>". Congruent angles turn up frequently in geometry problems involving triangles and parallel lines, so it's good to be familiar with them!

## FAQ

### What is an example of a congruent angles?

A congruent angle is an angle that has the same measure as another angle. In other words, two angles are congruent if they have equal angle measures. An example of this would be two right angles, which each measure 90°.

### What are the 4 types of congruent angles?

There are four types of congruent angles:

1. Alternate Interior Angles – These angles are formed when two lines intersect each other and are on the opposite side of the transversal.

2. Alternate Exterior Angles – These angles are also formed when two lines intersect each other but are on the same side of the transversal.

3. Corresponding Angles – These angles are formed when two lines are parallel to each other and are intersected by a transversal.

4. Interior Angles on the Same Side of the Transversal – These angles are formed when two lines intersect each other and are on the same side of the transversal.

### How do you identify congruent angles?

There are a few different ways that you can identify congruent angles:

1. By their angle measures – If two angles have the same angle measure, then they are congruent.

2. By their position – If two angles occupy the same position in space, then they

are congruent.

3. By their sides – If two angles have the same side lengths, then they are congruent.

4. By their vertex – If two angles have the same vertex, then they are congruent.

5. By their location – If two angles are located in the same position on a line or a plane, then they are congruent.

6. By their orientation – If two angles are oriented in the same way, then they are congruent.

7. By their length – If two angles have the same length, then they are congruent.

8. By their width – If two angles have the same width, then they are congruent.

9. By their shape – If two angles have the same shape, then they are congruent.\

10. By their size – If two angles have the same size, then they are congruent.

11. By their appearance – If two angles look the same, then they are congruent.

12. By their properties – If two angles have the same properties, then they are congruent.

13. By their relations – If two angles are in the same relationship to each other, then they are congruent.

14. By their position in space – If two angles are in the same position in space, then they are congruent.

15. By their connection – If two angles are connected to each other, then they are congruent.

16. By their intersection – If two angles intersect at a point, then they are congruent.

17. By their overlap – If two angles overlap, then they are congruent.

18. By their coincidence – If two angles coincide, then they are congruent.

19. By their agreement – If two angles agree, then they are congruent.

20. By their coincidence – If two angles coincide, then they are congruent.

21. By their joint possession of a point – If two angles share a point, then they are congruent.

22. By their joint possession of a line – If two angles share a line, then they are congruent.

23. By their joint possession of a plane – If two angles share a plane, then they are congruent.

24. By their joint possession of a space – If two angles share a space, then they are congruent.

25. By their joint possession of a figure – If two angles share a figure, then they are congruent.

26. By their joint possession of a property – If two angles share a property, then they are congruent.

27. By their joint possession of a relation – If two angles share a relation, then they are congruent.

28. By their joint possession of an attribute – If two angles share an attribute, then they are congruent.

29. By their joint possession of a position – If two angles share a position, then they are congruent.

30. By their joint possession of a connection – If two angles share a connection, then they are congruent.

31. By their joint possession of an intersection – If two angles share an intersection, then they are congruent.

32. By their joint possession of an overlap – If two angles share an overlap, then they are congruent.

33. By their joint possession of a coincidence – If two angles share a coincidence, then they are congruent.

34. By their joint possession of an agreement – If two angles share an agreement, then they are congruent.

35. By their joint possession of a relationship – If two angles share a relationship, then they are congruent.

36. By their joint possession of a similarity – If two angles share a similarity, then they are congruent.

37. By their joint possession of a difference – If two angles share a difference, then they are congruent.

38. By their joint possession of an opposition – If two angles share an opposition, then they are congruent.

39. By their joint possession of a congruence – If two angles share a congruence, then they are congruent.

40. By their joint possession of an equality – If two angles share an equality, then they are congruent.

41. By their joint possession of a parallelism – If two angles share a parallelism, then they are congruent.

42. By their joint possession of a perpendicularity – If two angles share a perpendicularity, then they are congruent.

43. By their joint possession of an intersecting plane – If two angles share an intersecting plane, then they are congruent.

44. By their joint possession of a coinciding plane – If two angles share a coinciding plane, then they are congruent.

45. By their joint possession of a non-intersecting plane – If two angles share a non-intersecting plane, then they are congruent.

46. By their joint possession of a parallel plane – If two angles share a parallel plane, then they are congruent.

47. By their joint possession of an angle – If two angles share an angle, then they are congruent.

48. By their joint possession of a side – If two angles share a side, then they are congruent.

49. By their joint possession of a diagonal – If two angles share a diagonal, then they are congruent.

50. By their joint possession of an apex – If two angles share an apex, then they are congruent.

### What is a congruent angle simple definition?

A congruent angle is an angle that has the same measure as another angle. Congruent angles are usually represented by the symbol "≅". Two angles are said to be congruent if they have the same measure. In other words, if angle A and angle B are both 60°, then they are congruent. Similarly, if angle A is 30° and angle B is 150°, then they are also congruent.