SUMMATIVE ASSESSEMENT 5:

Relationship Of Exterior And Interior Angles Of Convex Polygon

Read each item carefully and write the letter of your answer on a sheet of paper.

1. If the first three angles of a quadrilateral measures 540

, 860

, and 70o

respectively.

What is the measure of the fourth angle?

a. 1500

b. 1600

c. 1700

d. 1800

2. What is the sum of the measures of the interior angles of a coin, which is in the

shape of an octagon?

a. 8800

b. 9800

c. 1,0800

d. 1,18003. In Figure 1, ∡r = 140º and ∡s = 155º. Find

∡t.

a. 250

b. 400



c. 650

d. 900

4. What is the measure of each interior angle of a regular

dodecagon?

a. 120º b. 130º c. 140º d. 150º

5. If the measure of each interior angle of a regular polygon is 108º, which of the following is

the measure of its exterior angles?

a. 36º b. 72º c. 108º d. 144º

6. In Figure 2, compute for C.

a. 870

b. 880

c. 890

d. 900

7. How many sides does the polygon have if the sum of each interior angle is 1,980º?

a. 11 b. 12 c. 13 d. 14

8. If three of the angles of a pentagon measure 108º, 132º and 90º respectively, which of the

following is the measure of the remaining angles if they are equal?

a. 1050

b. 1100

c. 1200

d. 1250

9. If each interior angle of a regular polygon measures 120º, what is the total number of sides

in the polygon?

a. 4 b. 5 c. 6 d. 7

10. Which of the following could NOT represent the measure of an exterior angle of a regular

polygon?

a. 15º b. 27º c. 45º d. 72º


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