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anonymous
 one year ago
The sum of the interior angles of a heptagon is?
A.) 900°
B.) 1,080°
C.) 1,260°
D.) 1,440°
I got A, but not for sure.
anonymous
 one year ago
The sum of the interior angles of a heptagon is? A.) 900° B.) 1,080° C.) 1,260° D.) 1,440° I got A, but not for sure.

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mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0How many sides does a heptagon have?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0triangle = 3 sides quadrilateral = 4 sides pentagon = 5 sides hexagon = 6 sides heptagon = 7 sides octagon = 9 sides nonagon = 9 sides decagon = 10 sides

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0Now just use the same formula you have used in the last two problems. Here it is again: \(S = (n  2)180\) where S = sum of the measures of the interior angles, and n = number of sides.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0Rewrite the formula exactly as it is. The more you write it, the faster you'll memorize it. Then rewrite it with 7 instead of n. \(S = (n  2)180\) \(S = (7  2)180\) Now do 7  2. What is 7  2 = ?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0Great. Now you write: \(S = 5(180) \) Finally, what is 5 * 180 = ?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0Correct. This is what your notebook should look like: \(S = (n  2)180\) \(S = (7  2)180\) \(S = 5(180) \) \(S = 900\) The sum of the measures of the interior angles of a heptagon is 900 degrees.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0If you always start with the formula you will have to advantages: 1. you will get the formula right 2. you will memorize the formula from writing it many times
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