Isosceles triangles Quiz

Name: ______________________   Date: __________   Score: ____ / 10

10 questions. Calculator allowed. Show your working. steplyclass.com/geometry/isosceles-triangles/quiz/

1. 1

   Isosceles triangle top angle 40
   1. A) x = 180
   2. B) x = 70
   3. C) x = 110
   4. D) x = 140

2. 2

   Isosceles triangle top angle 100

   Answer: ____________________

3. 3

   Isosceles triangle base angle 50
   1. A) x = 180
   2. B) x = 100
   3. C) x = 80
   4. D) x = 130

4. 4

   Isosceles triangle top angle 90

   Answer: ____________________

5. 5

   Isosceles triangle top angle 36
   1. A) x = 180
   2. B) x = 36
   3. C) x = 72
   4. D) x = 144

6. 6

   Isosceles triangle top angle 120

   Answer: ____________________

7. 7

   Isosceles triangle base angles 4x − 10 and 2x + 30. Find x.
   1. A) x = 20
   2. B) x = 40
   3. C) x = 10
   4. D) x = 30

8. 8

   Isosceles triangle base angle 30

   Answer: ____________________

9. 9

   Isosceles triangle top angle x, base angle x + 30. Find x.
   1. A) x = 60
   2. B) x = 180
   3. C) x = 40
   4. D) x = 75

10. 10

    Isosceles triangle top angle 60

    Answer: ____________________