The area (in m2) of a circular path of uniform width x meters surrounding a circular region of diameter d meter is .........
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. πx(x + d)
| Understanding | Application |
| Tricks |
According to question
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| Now |
Area of the path = Area of big circle - area of small circle ⇒ πR2 - πr2 ⇒ π(d/2 + x)2 - π(d/2)2 ⇒ π(d2/4 + x2 + dx) - π(d2/4) ⇒ πx2 + πdx ⇒ πx(x + d) |
