#1**+1 **

I only have time for the first one

The nonagon will have 9 equal isosceles triangles .....with equal sides of 14m and and included angle of 40°

So....the total area =

9 (1/2) (14^2) sin (40) ≈ 566.9 m^2

CPhill
Apr 24, 2017

#2**+1 **

Thank you for your time :) You've been really great help to me and i'm getting better with your step ways. I figure out the sec one it's B right?

NotSoSmart
Apr 24, 2017

#3**+1 **

This one is a little more difficult........

The length of one side = 90 / 15 = 6

The 15-gon will be comprised of 30 equal triangles.......the base = side/ 2 = 6/2 = 3m

And the height will be given by : 3/ tan (12° )

So......the total area =

30 (1/2) (3) ( 3/ tan 12° ) ≈ 635.1 m^2

Good job, NSS !!!!!!......looks like you're learning this stuff!!!

CPhill
Apr 24, 2017