Question

Kelly found the area of the composite figure below and showed her work on a quiz. Her teacher marked her answer incorrect.

A. Identify and explain Kelly's error.
B. Find the correct area of the composite figure.

Answer 1

446.75 y^2

Explanation:

First, Kelly found the area of a circle, not half a circle, which is on top of the figure. She also shouldn't have subtracted the area of the circle by the airea of the base, as she is trying to find the area of the ENTIRE figure.

.5 TIMES pi times 9^2 = 122.75

the second part, calculating the square base is correct..

122.75+324 = 446.75 y^2