Question

I need help with number 3

Answer 1

Area  of circle  = pi r^2 = 78.54
r^2 = 78.54 / pi = 25
r = 5 inches

Each line from centre of the circle to a point on the hexagon = 5 ins

so  consider one of the 6 congruent triangles formed from these lines:-
Vertex angle = 60 degrees

sin 30  = 0.5s / 5    (where  s = one side of the hexagon).
0.5s = 5*0.5 = 2.5
s = 2.5 / 0.5 =  5 

So the perimeter of the hexagon is 6*5  = 30 inches