area = (½)(apothem)(perimeter)
area = 1/2 a (72)
area = 36a
Therefore, the area of an 18gon would be 36a where a is the apothem. Hope this answers the question. Have a nice day.
the area is multiplying all the given measurements together.
40 * 18 * 30 * 24 = 518,400
12. 18gon with perimeter 72mm....