Geometric Modeling problem verification - please

R-Gtr

New member
Joined
Jun 28, 2009
Messages
2
Problem:

A rectangle is inscribed in a circle of diameter 33". Express P, the perimeter as a function of L, its length.

My work and answer: (I used the Pythagorean Thereom but changed A & B to W & L, as I believe the diamter of the circle would divide the rectangle in half creating two right-triangles.)

(33)^2 = (W^2) + ( L^2)
1089 + (L^2) = W^2
sqrt(1089 + (L^2)) = W

P(L) = 2L + 2(sqrt(1089 + (L^2)))

Is this correct? :?: :|
 
Correct; I think this is sufficient:

Let L = Length; then width = sqrt(33^2 - L^2)

P = 2[L + sqrt(33^2 - L^2)]
 
Top