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A circle has a radius of 7 cm. What is the area of the circle? (Use π ≈ 3.14)

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Question: A circle has a radius of 7 cm. What is the area of the circle? (Use π ≈ 3.14)

Options:

  1. 154 cm²
  2. 144 cm²
  3. 160 cm²
  4. 150 cm²

Correct Answer: 154 cm²

Solution: 

Area = πr² = 3.14 × (7)² = 3.14 × 49 = 153.86 cm², which rounds to 154 cm².

A circle has a radius of 7 cm. What is the area of the circle? (Use π ≈ 3.14)

Practice Questions

Q1
A circle has a radius of 7 cm. What is the area of the circle? (Use π ≈ 3.14)
  1. 154 cm²
  2. 144 cm²
  3. 160 cm²
  4. 150 cm²

Questions & Step-by-Step Solutions

A circle has a radius of 7 cm. What is the area of the circle? (Use π ≈ 3.14)
  • Step 1: Identify the formula for the area of a circle, which is Area = πr².
  • Step 2: Substitute the value of π with 3.14 and the radius (r) with 7 cm into the formula.
  • Step 3: Calculate the square of the radius: (7)² = 49.
  • Step 4: Multiply π (3.14) by the squared radius (49): 3.14 × 49.
  • Step 5: Perform the multiplication: 3.14 × 49 = 153.86.
  • Step 6: Round the result to the nearest whole number: 153.86 rounds to 154.
  • Area of a Circle – The area of a circle is calculated using the formula A = πr², where r is the radius.
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