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I solved these questions using a different formula from the one taught in the lesson because I didn't know how to use it.
And my teacher wants me to use the one taught in the lesson.
The answers are all correct, she just wants me to use this formula; 5 * (area of triangle).
3. A regular pentagon with a side of 3 centimeters
A = 1/4 √5 ( 5 + 2√5 ) a^ 2
15.48 sq cm. A = 1/4 √5 ( 5 + 2√5 ) 3^ 2 ~ 15.4843
4. A regular hexagon with a side of 10 cm
A = 3√3/2 a^2
259.81 sq cm. 3√3/2 10^2 ~ 259.81
5. A regular heptagon with a side of 7 inches.
178.06 sq in.
A = 7/4 a^2 Cot (180/7)
7/4 7^2 Cot (180/7) ~ 178.06
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