Question 42
Mensuration of Plane ShapesThe diagram shows a rectangular cardboard from which a semi-circle is cut off. Calculate the area of the remaining part.
- A.44 cm2
- B.99 cm2
- C.154 cm2
- D.165 cm2
Show the answer and explanation
Answer: B (99 cm2)
Explanation
Rectangle = 22 × 8 = 176 cm2. Semicircle diameter = 22 − 4 − 4 = 14 cm, so area = ½ × 22/7 × 72 = 77 cm2. Remaining = 99 cm2.