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- Write the ratio clearly.
- Find the common multiplier.
- Apply it to the missing term.
Correct Answer: B
Correct Answer: B
Method / Topic: Mensuration
The answer keeps the ratio proportional.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Mensuration
The area of a circle is πr². Here r=7 cm and π=22/7. So area = 22/7 × 7 × 7 = 22 × 7 = 154 cm². A quick way: when radius is 7 and π is 22/7, one 7 gets cancelled immediately.
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Write the ratio clearly.
- Find the common multiplier.
- Apply it to the missing term.
The radius of a circle is 7 cm. What is its area? Use π = 22/7.
Explanation
Correct Answer: B
Method / Topic: Mensuration
The answer keeps the ratio proportional.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Mensuration
The area of a circle is πr². Here r=7 cm and π=22/7. So area = 22/7 × 7 × 7 = 22 × 7 = 154 cm². A quick way: when radius is 7 and π is 22/7, one 7 gets cancelled immediately.
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