11.1-11.2 Review
The answers are on the last slide to
check when you’re done.
1. What is the sum of the interior
angles of a nonagon?
2. What is the sum of the exterior
angles of a 32-gon?
3. What is the measure of one
interior angle of a regular 20-gon?
4. What is the measure of one
exterior angle of a regular
pentagon?
5. The measure of one interior
angle of a regular polygon is 120o.
How many sides does it have?
6. The measure of one exterior
angle of a regular polygon is 45o.
How many sides does it have?
7. The sum of the interior angles
of a polygon is 2700o. How many
sides does it have?
8. Solve for x.
(x2)o (10x + 20)o
140o
(8x)o
150o
130o
9. Solve for x.
10. A regular hexagon has a radius
of 14 cm. Find its area. Keep your
answer in exact, simplest form.
11. A regular nonagon has an
apothem of 2 in. Find its area.
Round to the nearest tenth at the
end.
12. A regular dodecagon (12 sides)
has a radius of 6 mm. Find its area.
13. A regular hexagon has a side of
8 cm. Find its area. Keep your
answer in exact, simplest form.
14. A regular 20-gon has an area
of 150 ft2. Each side is 5 ft. Find its
apothem.
15. A regular hexagon has an
apothem of 6 in. Find its radius in
exact, simplest form.
1.
2.
3.
4.
5.
6.
7.
8.
1260o
360o
162o
72o
6 sides
8 sides
17 sides
x = 10
9. x = 6
10. 293 3 cm2
11. 13.1 in2
12. 108 mm2
13. 96 3 cm2
14. 30 ft
15. 4 3 in