Question

Answer my question......

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100 points...
maths.. ..

Answer 1

Hey mate, here is your answer -:)

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$area \: of \: circle = {\pi \: r}^{2} \\ area \: of \: the \: shaded \: region = \pi {(2)}^{2} - \pi {(1)}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 4\pi - \pi \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 3\pi \: sq.units$

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HOPE it helps to you!!

Answer 2

$<b > Answer$

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Given :-

Two coins of diameter 2cm and 4cm respectively are kept one over the other as shown in the figure.

To find :-

The area of shaded ring shaped in square cm.

Salutation :-

The radius of the first circle is ( r ) 2 / 2 cm = 1 cm

And , the area is π×r² cm² = π cm²

And , the radius of the second circle is ( R ) 4 / 2 cm = 2 cm

So , the area is πR² = π× ( 2 )² cm² = 4π cm²

Therefore , The area of shaded ring shaped in square cm will be

( 4π - π ) cm²

= 3π cm²

= 3 × 22 / 7 cm²       [ • π = 22 / 7 ]

= 66 / 7 cm²             [ ★ Required answer ]

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