Question

1. If the circumference and area of a circle are numerically equal, then the diameter of the circle is: ​

Answer 1

Answer:

Let r be the radius of the circle.

Then, circumference of a circle =2πr$

and area of a circle =πr

2

.

Given, circumference and area are equal.

Then, 2πr=πr

2

⟹ r=2.

We know, diameter =2r.

Therefore, diameter =2(2)=4.

Hence, option D is correct.

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Answer 2

Answer:

I think this is answer of class 10th chapter 12