Browse · harp
Printimc
geometry intermediate
Problem
Four circles of radius are each tangent to two sides of a square and externally tangent to a circle of radius , as shown. What is the area of the square? 
(A)
(B)
(C)
(D)
Solution
We draw the diagonal of the square. This diagonal yields . We know that the side length in terms of the diagonal is , so our side length is . However, we are trying to look for the area, so squaring yields
Final answer
B