Verified by Ajay Kumar
Find the area of a quarter-circle with radius 7 cm.
38.5 cm²
114 cm²
14 cm²
144 cm²
Answer: A
Solution: Area of a quarter-circle \(=\frac14\pi r^2\). Taking \(\pi=\frac{22}{7}\) and r = 7 cm, the area is \(\frac14\times\frac{22}{7}\times7^2=38.5\text{ cm}^2\). Trick: Calculate the full circle's area and divide it by 4.
7 सेमी त्रिज्या वाले वृत्त के एक चतुर्थांश का क्षेत्रफल ज्ञात कीजिए।
38.5 सेमी²
114 सेमी²
14 सेमी²
144 सेमी²
उत्तर: A
हल: चतुर्थांश का क्षेत्रफल \(=\frac14\pi r^2\) होता है। \(\pi=\frac{22}{7}\) और r = 7 सेमी रखने पर क्षेत्रफल \(\frac14\times\frac{22}{7}\times7^2=38.5\text{ सेमी}^2\) है। ट्रिक: पूरे वृत्त का क्षेत्रफल निकालकर 4 से भाग दें।
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