ISEE Upper Level Quantitative : How to find area

Study concepts, example questions & explanations for ISEE Upper Level Quantitative

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Example Questions

Example Question #111 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

Rectangle 1

The above rectangle, which has perimeter 360, is divided into squares of equal size. Give the area of the shaded portion.

Possible Answers:

\displaystyle 700

\displaystyle 1,400

\displaystyle 2,800

\displaystyle 5, 600

Correct answer:

\displaystyle 2,800

Explanation:

The sides of the rectangle, in total, are divided into 18 segments of equal measure, as indicated below:

Rectangle 2

The rectangle has a total perimeter of 360, so each segment - one side of a square - measures \displaystyle 36 0 \div 18 = 20. Each square has area \displaystyle 20 ^{2} = 400, so the shaded portion of the rectangle, which comprises seven squares, has area

\displaystyle 400 \times 7 = 2,800.

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