Cos(x°) = (√3)/2
cos⁻¹[(√3)/2] = x°, that means x° = 30°
For the base of the shape all you need to do is multiply 25x25=625ft²
then for the 4 sides you need to multiply 25x32=800ft²
and because there are 4 sides you multiply 800x4=3200
so now you add 3200 with 625 (3825) and there's your area
Graph b has a correlation closest to -0.95
There is not enough information
