Find the SUM of the interior angles of a shape with ______ sides. (Fill in the blank and solve)
1 answer:
Answer:
(n-2)180
Step-by-step explanation:
Let us assume the number of sides is 'n'.
So,
The SUM of the interior angles of a shape with n sides is given by the formula (n-2)180
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x^2 = 81
so x = 9 and 3x = 27
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