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Name:
Date:
Period:
Find the value of x, substitute to find the angles, then classify each triangle as acute, right or obtuse.
1.
2.
116°
(3x + 2)°
3.
(4x + 3)°
(3x + 1)°
32°
59°
____________________
4.
54°
36°
23°
____________________
5.
____________________
6.
59°
(2x)°
(2x – 10)°
(6x + 1)°
90°
54°
____________________
(x + 40)°
(3x - 10)°
____________________
(x – 20)°
____________________
In questions 7 – 9, find the value of x, then substitute to find all the angles.
7.
8.
9.
30º
(8 + 6x)°
(8x + 4)°
(3x + 4)°
(5x + 10)°
58°
140°
(4x + 2)°
____________________
10.
(11x + 2)º
____________________
____________________
Find the sum of the interior angles of a regular nonagon.
__________________
11.
Find the sum of the exterior angles of a regular 15-gon.
__________________
12.
Find ONE exterior angle of a regular 15-gon.
__________________
13.
A triangle with TWO congruent (equal) sides, is a(n) __________________ triangle.
14.
If the sides of a triangle are 2x + 5, 3x + 20, and 5x and the perimeter of the
triangle is 155, find each side.
15.
_____, ______, _____
What kind of triangle is #14?
__________________
Triangle Polygon Review Sheet
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