the letter of the correct answer
9. What is the interior angle of heptagon?
a. 1320
b. 1300
c. 1290
d. 1280
10. Which of the following is not a part of regular polygon?
a. angle
b. degree
11. How many sides are there in a nonagon?
a eight
b. nine
C Seven
d. six
12. What is the interior angle of square?
a. 600
b. 709
C. 800
d. 90°
13-15. What is the formula in computing
polygon?
c. side
d. vertex​