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