The area of the circle whose diameter is 21 cm is(a) 346.5 cm²(b) 37.

1.	The area of the circle whose diameter is 21 cm is(a) 346.5 cm²(b) 37.68 cm²(c) 18.84 cm²(d) 19.84 cm²Answer it with explanation
Answer» ANSWER: $\huge\boxed{\fcolorbox{syam}{blue}{AnSwer}}$ ==>(a) 346.5 cm² Explanation Reason: Here diameter = 21 cm $∴ Radius r = \: \frac{21}{2} \: cm$ Area of the CIRCLE, A = πr² $∴A = \frac{22}{7} \times \frac{21}{2} \times \frac{21}{2} = 11 \times 3 \times \frac{21}{2} = \frac{693}{2} = 346.5$ cm²