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What is the area of a circle with a radius of 7 cm? (Use π = 22/7) (2019)

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Question: What is the area of a circle with a radius of 7 cm? (Use π = 22/7) (2019)

Options:

  1. 154 cm²
  2. 44 cm²
  3. 77 cm²
  4. 88 cm²

Correct Answer: 154 cm²

Exam Year: 2019

Solution: 

Area = πr² = (22/7) × (7)² = (22/7) × 49 = 154 cm².

What is the area of a circle with a radius of 7 cm? (Use π = 22/7) (2019)

Practice Questions

Q1
What is the area of a circle with a radius of 7 cm? (Use π = 22/7) (2019)
  1. 154 cm²
  2. 44 cm²
  3. 77 cm²
  4. 88 cm²

Questions & Step-by-Step Solutions

What is the area of a circle with a radius of 7 cm? (Use π = 22/7) (2019)
  • Step 1: Identify the formula for the area of a circle, which is Area = πr².
  • Step 2: Substitute the value of π with 22/7 and the radius (r) with 7 cm into the formula.
  • Step 3: Calculate r² (7 cm squared), which is 7 × 7 = 49 cm².
  • Step 4: Multiply π (22/7) by r² (49 cm²). So, it becomes (22/7) × 49.
  • Step 5: Simplify the multiplication. First, multiply 22 by 49 to get 1078, then divide by 7.
  • Step 6: Calculate 1078 ÷ 7, which equals 154 cm².
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