Geometry
posted by Justin on .
1. How many sides does a regular polygon have if one exterior angle is 90 degrees?
3
4
5
6
2. The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle.
67
77
87
97
3. The sum of the interior angles of a 7gon is
900
1,080
1,260
1,440
4. One exterior angle of a regular pentagon measures
60
72
90
120
5. If all of the diagonals are drawn from a vertex of a pentagon, how many triangles are formed?
2
3
4
5
6. A polygon is such that when all diagonals from one vertex are drawn, eleven triangles are formed. How many sides does the polygon have?
9
11
12
13
7. The sum of the measures of the interior angles is 1,440 degrees. How many sides does the polygon have?
4
6
8
10
8. How many sides does a regular polygon have if one exterior angle is 1?
120
180
360

1. Ae = 360 / N = 90,
90N = 360,
N = 360 / 90 = 4 Sides.
2. At = 80 + 90 + 103 + x = 360,
X = 360  273 = 87 deg.
3. At =(N  2)180,
At = (7  2)180 = 900 deg.
4. Ae = 360 / N = 360 / 5 = 72 DEG.
5.
6.
7. At = (N  2)180 = 1440,
(N  2) = 1440 / 180 = 8,
N = 8  2 = 6 Sides.
8. Ae = 360 / N = 1 Deg,
N = 360 Sides.