In the given problem, apply your knowledge in algebraic expression and basic mathematics especially in solving word problem about area of a circle.
Given
Circular board with a diameter 80 cm
Divided the board into 20 congruent sectors.
Problem
What is the area of each sector?
Solution
Use the formula for solving area of a circle A = πr².
r = 1/2d
r = 1/2(80)
r = 40 cm
A = π(40)²
A = 1 600π cm²
Solve for the area of each sector
A ÷ 20
1 600π cm² ÷ 20 = 80π cm²
When π = 3.14
80π = 251.33 cm²
Answer
80π cm² or 251.33 cm²
Learn more about solving area of a circle here at
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