AMC8 1990 Problem 15

Past Contests AMC8 AMC 8 - 1990
1

The area of this figure is 100 \mathrm{~cm}^{2}. Its perimeter is [figure consists of four identical squares]
Image
Answer Choices
A. 20 \mathrm{~cm}
B. 25 \mathrm{~cm}
C. 30 \mathrm{~cm}
D. 40 \mathrm{~cm}
E. 50 \mathrm{~cm}