Question

The radius of a circular Frisbee is 9.8 centimeters. Using rounding to the nearest whole number, what is an estimate for the circumference of this circle?

A. 50 cm
B. 60 cm
C. 65 cm
D. 72 cm

Answer 1

60 cmcircumference of this circle

Answer 2

Given:

The radius of a circular Frisbee is 9.8 centimeters. Using rounding to the nearest whole number, what is an estimate for the circumference of this circle?

To find:

What is an estimate for the circumference of this circle?

Solution:

The radius of the circular Frisbee, r = 9.8 centimeters

We know,

$\boxed{\bold{Circumference \:of\:a\:circle = 2 \pi r}}$

Now, by using the above formula of the circumference of a circle, we get

The circumference of the given circle is,

= $2 \times \frac{22}{7} \times 9.8$

= $\frac{431.2}{7}$

= $61.6\:cm$

We will now round off the obtained answer to its nearest whole number

So, since the digit after the decimal is greater than 5, therefore, we should round 61.6 cm to the next number i.e., 62 cm

But if we see the options the closest whole number to 61.6 cm is 60 cm.

Thus, an estimate for the circumference of this circle is → 60 cm.

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