Answer:
The area of the SHADED region is 21 cm.²
Explanation:
The area of the SHADED region is the difference between the area of the entire figure and the area of the UNSHADED region
The shape of the UNSHADED region is a rectangle
The area of a rectangle, A = The length × The width
∴ The area of the UNSHADED region, A = 1 cm × 4 cm = 4 cm²
The area enclosed by the entire figure is in the shape of a square
The area of a square s similar to the area of the rectangle, but because a square has equal side length, the area of a square, A = Side length × Side length
Therefore, the area enclosed by the entire figure = 5 cm × 5 cm = 25 cm²
The area of the SHADED region = The area enclosed by the entire figure - The area of the UNSHADED rectangular figure inside
That is the area of the SHADED region = 25 cm² - 4 cm² = 21 cm².