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What is the area of a circle with a radius of 7 cm?
What is the area of a circle with a radius of 7 cm?
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Practice Questions
1 question
Q1
What is the area of a circle with a radius of 7 cm?
154 cm²
49 cm²
28 cm²
100 cm²
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The area of a circle is given by A = πr². Thus, A = π(7)² = 49π ≈ 154 cm².
Questions & Step-by-step Solutions
1 item
Q
Q: What is the area of a circle with a radius of 7 cm?
Solution:
The area of a circle is given by A = πr². Thus, A = π(7)² = 49π ≈ 154 cm².
Steps: 7
Show Steps
Step 1: Identify the formula for the area of a circle, which is A = πr².
Step 2: Substitute the radius (r) into the formula. Here, the radius is 7 cm, so we have A = π(7)².
Step 3: Calculate (7)², which is 49.
Step 4: Now, substitute back into the formula: A = π(49).
Step 5: This simplifies to A = 49π.
Step 6: If you want a numerical approximation, use π ≈ 3.14. So, A ≈ 49 × 3.14.
Step 7: Calculate 49 × 3.14, which is approximately 154 cm².
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