
We need to prove that, for , the area of the shaded region in Figure 9 is equal to the four-thirds the area of triangle ACE, where is the point on the parabola at which the tangent line is parallel to the secant line .
(a) We need to show that has x coordinate .
(b) We need to prove that ABDE has area by viewing it as a parallelogram of height and base of length .
(c) We need to show that the triangle ACE has area by observing it has the same height and base as the parallelogram.
(d) We need to compute the shaded area as the area under the graph minus the area of a trapezoid. We need to prove the Archimedes’ result.

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Chapter 5 Solutions
Loose-leaf Version for Calculus: Early Transcendentals Combo 3e & WebAssign for Calculus: Early Transcendentals 3e (Life of Edition)
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