Question

formula given didnt help
help me
formula for area of a decagon i got
1/2 x apothem x perimeter
shapes a decagon with a side of 3.6 and an apothem 5.45

Answer 1

A decagon has ten sides. Assuming that the decagon is regular, the formula for area is the following:
A = (1/2) a * p where a is the apothem and p is the perimeter of the regular decagon
A = (1/2) * 5.45 * (10 * 3.6) --> Note that (10 * 3.6) = 36 which is the perimeter
A = 91 square units

Answer 2

yeah i got 99.72 for area

Answer 3

Our answers should not vary that much. Would you check my work, please? Thanks.

Answer 4

5.54 is apothem, 3.6 is side. Find the area of the Triangle [(base x height) (divided by 2)] then multiply by 10 sides.

5(5.54x3.6)= 99.72 now thats my work

Answer 5

@suzy4321 --> I think you may have reversed the digits on the apothem -->
apothem 5.45 --> Not 5.54

Answer 6

oops but the correct one was 54 so its ok and u were prob right anyways