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Area of Plane Figures II - JSS3 Mathematics Past Questions and Answers - page 2

11

Calculate the area of a sector of a circle with radius 12 cm and a central angle of 90∘.

Area of Sector=90∘/360∘×𝜋×(12 cm)^2 

Area of Sector=¼×𝜋×144

Area of Sector=36𝜋

Area of Sector ≈ 113.10 square centimeters

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12

Determine the area of a rectangle with length 15 meters and width 8 meters.

Area=length×width

Area=15 m×8 m

Area=120 square meters

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13

A triangular garden has a base of 10 meters and a height of 6 meters. Find its area.

Area=½×base×height

Area=1/2 ×10 m×6 m

Area=30 square meters

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14

Calculate the area of a trapezoid with bases of lengths 8 meters and 12 meters, and a height of 5 meters.

Area=1/2×(base1+base2)×height

Area=1/2×(8 m+12 m)×5 m

Area=½ × 20 m×5 m

Area=50 square meters

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15

Find the area of a sector of a circle with radius 15 cm and a central angle of 120∘

Area of Sector=120∘/360∘×𝜋×(15 cm)^2

Area of Sector=/13×𝜋×225

Area of Sector=75𝜋

Area of Sector≈235.62 square centimeters

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