Problem: In a triangle, the area is numerically equal to the perimeter. What is the radius of the inscribed circle?
Answer Choices:
A. 222
B. 333
C. 444
D. 555
E. 666 Solution:
If rrr is the radius and ppp the perimeter, then the area of the triangle is 12pr=p\dfrac{1}{2} p r=p21​pr=p. Therefore r=2r=2r=2.