3 years ago

A drink coaster in the shape of a circle has

Mathematics

1 answer:

egoroff_w [7]3 years ago

5 0

The diameter of the coaster is 5 cm.

Step-by-step explanation:

Given,

The area of the circle = 19.63 sq inch

To find the diameter, we need to find the radius

Formula

The area of a circle with radius(r) = π $r^{2}$ sq cm

According to the problem,

π $r^{2}$ = 19.63

or, $r^{2}$ = $\frac{7 X 19.63}{22}$

= 6.2459

or, r = $\sqrt{6.2459}$ = 2.499 (approx)

= 2.5 cm

Hence the diameter of the circle = 2 × 2.5 cm = 5 cm

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