What is the area of a regular nonagon with 10 cm sides and an apothem of 6 cm?

Answer 1

The polygon contains 9 identical isosceles triangles each with area 30.

The area of each isosceles triangle is 2 * (1/2)*6*5.

Answer 2

Area = 9(1/2bh) There are 9 triangles, so finding the area of one of the triangles then multiplying by 9

=9/2(10)(6) = 270 cm²

Answer 3

A regular nonagon has 9 equal sides, so you can compute the perimeter from that.

The area of any regular polygon = 1/2 * apothem * perimeter.