Question

If the area of circular sharped dart board is 1386 sq.cm find its radius and diameter

Answer 1

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Step-by-step explanation:

Area= 1486 cm².

Let radius be x.

We know that area of circle = πr².

= 3.14× X² = 1486cm².

=) X²= 474.24 cm²

X= √474.24

X= 21.77 cm.

So, radius = 21.77 cm.

Now, diameter= 2× radius = 2× 21.77= 43.54 cm.

Answer provided by gauthmath.

Answer 2

$\huge \bold\green{ Question :- }$

• If the area of circular sharped dart board is 1386 sq.cm find its radius and diameter.

$\huge \bold\blue{ Solution:- \: }$

Area of circular dart board is 1386 cm².

Area of circle of radius r = πr² = 1386

$= > \frac{22}{7} \times {r}^{2} = \: 1386 \\ = > \: {r}^{2} = \: \frac{1386 \times 7}{22} \\ = > \: {r}^{2} = \: 441 \: {cm}^{2}$

$= > r = \: { \sf{ \color{maroon}{21 \: cm}}}$

Now,

diameter of circle = 2r

=> 2 × 21

$= > \: d \: = \: { \sf{ \color{maroon}{42 \: cm}}}$

Hence, radius of circular dart board = ${ \sf{ \color{purple}{21 \: cm \: }}}$

and diameter of circular dart board = ${ \sf{ \color{purple}{42 \: cm \: }}}$

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