Question

nadiyah found the circumference of a circle with a diameter of 4.9 in to be 20in. is her answer reasonable? explain

Answer 1

the answer isn't reasonable. the actual circumference is 15.386

Answer 2

The circumference of circle is given by :

`C =2\pi r`

where r is radius of circle and pi =3.14

Radius = half of diameter

Radius = (1/2) *4.9 = 2.45 in.

Now let us plug the value of radius in the formula for circumference.

`C =2(3.14)(2.45)`

C = 15.386 inches

But circumference found by Nadiyah is 20 inches.

So the circumference found by Nadiyah is incorrect as correct one is 15.386 inches.