Area of Square and Triangle.
Level: High School, SAT Prep, College
In the figure below, given an square
ABCD of area S, E is the intersection of BD and the semicircle
of diameter AD, and CF is tangent to the semicircle. If S1 is
the area of triangle DEF, prove that: .
Geometric Art: Hyperbolic Kaleidoscope of problem 112
using iPad Apps: Equilateral Triangles and Squares