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February 28, 2015

February 28, 2015

Posted by **Delilah** on Tuesday, February 5, 2013 at 8:21pm.

Find the sum of the interior angles of a nonagon. (1 point)

140°

1,620°

1,260°

1,450°

4.

Find the measure of each interior angle of a polygon with 12 sides. (1 point)

1,800°

150°

180°

145°

5.

Four of the angles of a pentagon measure 85°, 110°, 135°, and 95°. Find the measure of the missing angle. (1 point)

115°

95°

135°

85°

My answers:

2. 1,260°

4. 150°

5. 115°

- 7th grade math Ms. Sue please -
**Ms. Sue**, Tuesday, February 5, 2013 at 8:28pmAll are right.

- 7th grade math Ms. Sue please -
**Damon**, Tuesday, February 5, 2013 at 8:38pm2.

Find the sum of the interior angles of a nonagon. (1 point)

140°

1,620°

1,260°

1,450°

When you walk all the way around a figure with straight sides clockwise you turn 360 degrees. Ech of your right turns is 180 - interior angle there

in this case 9 * right turn angle = 360

right turn angle = 40

so each interior angle is 180 - 40 = 140

9* 140 = 1260

4.

Same deal for the next one

360/ 12 = 30

180 - 30 = 150 = interior angle

5.

each exterior angle = 180 - angle

180 - 85 = 95

180 - 110 = 70

180 - 135 = 45

180 - 45 = 85

then we have (180-x)

95+70+45+85 +180 - x = 360

475 - x = 360

x = 115

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