### Home > GC > Chapter 12 > Lesson 12.2.4 > Problem12-91

12-91.

Other ways of dividing the shape (for example, into a trapezoid, a square, and a portion of a circle) are also acceptable.

The following area formulas will prove to be useful:

$\textrm{Triangle: } A=\frac{1}{2}bh$

$\textrm{Circle: }A=\pi r^{2}$

$\textrm{Rectangle: } A=lw$

Use trigonometry to find the necessary lengths. Note that 125 - 90 = 35.