What is the area of a square computer screen with 21-in. sides?
A. 84 sq. in.
B. 220 sq. in.
C. 42 sq. in.
D. 441 sq. in.
please help
Area of a square
= (length of each side)²
If each side is measured in inches, the area is in square inches, or in².
To find the area of a square computer screen, you need to square the length of one side. In this case, the sides of the screen are 21 inches long.
The formula to find the area of a square is: Area = side * side
So, the area of the square computer screen is:
Area = 21 inches * 21 inches = 441 square inches
Therefore, the answer is D. 441 sq. in.
To find the area of a square computer screen, you need to multiply the length of one of its sides by itself. In this case, the length of each side is given as 21 inches.
So, to find the area, you would calculate 21 inches multiplied by 21 inches:
Area = 21 in. × 21 in.
Calculating this gives us:
Area = 441 sq. in.
Therefore, the correct option is D. 441 sq. in.
D. 441 sq ft.
21*21