2. What do we know about angles? Three types Acute Right Obtuse

3. An acute angle’s measurement is less than 90 degrees.

4. A right angle measures exactly 90 degrees.

5. An obtuse angle’s measurement is greater than 90 degrees but less than 180 degrees.

6. What type of angle is this? a)AcuteAcute b)ObtuseObtuse

7. An acute angle is less than 90 degrees. Try Again!

8. That angle measures over 90 degrees making it obtuse!

10. A right triangle has exactly one right angle.

11. An acute triangle has three acute angles.

12. Finally, an obtuse triangle has one obtuse angle.

13. Finally, an equiangular triangle has all angles of 60 degrees. 60 0

14. According to angles how would you classify this triangle? a)Acute TriangleAcute Triangle b)Right TriangleRight Triangle

15. A right triangle has at least one right angle. Like the one below. Try Again!

16. An acute triangle has all acute angles, which are less than 90 degrees. Great Job!

18. A scalene triangle has no congruent sides. Congruent means equal.

19. An isosceles triangle has two congruent sides.

20. An equilateral triangle has all congruent sides and angles.

21. You can classify this triangle two ways which are they?? 1.Scalene and ObtuseScalene and Obtuse 2.Isosceles and AcuteIsosceles and Acute 3.Equilateral and RightEquilateral and Right

22. A triangle that is obtuse has an angle that measures over 90 degrees. Also a scalene triangle has no congruent sides, this triangle had two sides which were congruent. Try again!

23. An equilateral triangle has all equal sides and equal angles. This triangle only had two congruent sides. Try again!

24. An isosceles triangle has two congruent sides. An acute triangle is made up of only acute angles. Good Job!

25. A triangle can be a right triangle and a scalene triangle True False

26. A right triangle does not always have a set of congruent sides, rethink your answer and try again!

27. A triangle can have a right angle and still have no congruent sides.

28. All angles will always be 60 0. Will always be an equilateral triangle too. 60 0 Classifying Triangles by Their Angles All 3 angles measure less than 90 degrees. 80 40 60 One angle measures 90 degrees and the other two angles are acute. One angle that measures more than 90 degrees and the other two are acute. 130 20 30

29. Classifying Triangles by Their Sides 3 congruent sides 2 congruent sides No congruent sides All angles will always equal 60 0. Angles that are not formed by the equal sides are also equal No equal angles

30. Now you know the basics of angles and how to classify triangles!