Answer:
7. 100
8. 56
9. 51
Explanation:
Area of triangle: Length × breadth ÷ 2
Area of rectangle/square: Length × breadth
7. Area of shaded region = (20 × 10) - (20 × 10 ÷ 2)
= 100
8. Area of shaded region = (8 × 8) - (4 × 4 ÷ 2)
= 56
9. Area of shaded region = (15 × 5) - (3 × 8)
= 51