The area of a circular coaster is 78.5 cm². What is the radius of the coaster? (Use π = 3.14)
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Worked Solution
Step 1: Write the area formula: A = πr².
Step 2: Substitute A = 78.5 and π = 3.14: 78.5 = 3.14 × r².
Step 3: Solve for r²: r² = 78.5 ÷ 3.14 = 25.
Step 4: Find r: r = √25 = 5 cm.
The radius of the coaster is 5 cm.
Answer: 5 cm
Correct answer: 5 cm
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