2. If the three angles of a quadrilaterals are 20°, 130° and 75º, what is the measure of the
fourth angle?
a. 120°
b. 135°
C. 150°
d. 110°
3. How many sides does a polygon have if the sum of its interior angles is 1620°?
a. 11
b. 9
C. 8
d.7
4. If each exterior angle measures 12º, how many sides does this polygon have?
a. 12
b. 36
c. 30
d. 3
5. Find the sum of the measures of the interior angles of a regular polygon that has 16 sides.
a. 25000
b. 2 440°
c. 2 520°
d. 2 700
6. The interior angles of an irregular hexagon are; 80°, 130°, 102°, 36°, x° and 146°.
What is the measure of angle x?
a. 224°
b. 225°
C. 226°
d. 2270​