Question

The radii of two concentric circle are 8.4 cm and 7cm. the area enclosed between them is.à​

Answer 1

Answer:

$\bf \fbox \purple {area enclosed between two concentric circles is 67.76 cm²}$

Step-by-step explanation:

GIVEN:-

RADIUS OF TWO CONCENTRIC CIRCLES

LET'S SAY RADIUS OF THE OUTER CIRCLE THAT IS LARGER IS 8.4 cm

RADIUS OF THE INNER CIRCLE THAT IS SMALLER IS 7CM

AREA OF THE OUTER CIRCLE ⭕ = πR²

$\frac{22}{7} \times 8.4 \times 8.4 \\ \\ = > 22 \times 1.2 \times 8.4 \\ \\ = > 221.76$

AREA OF THE OUTER CIRCLE = 221.76cm²

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SIMILARLY,

AREA OF THE INNER CIRCLE ⭕ = π r²

$= \frac{22}{7} \times 7 \times 7 \\ \\ = > 22 \times 7 \\ \\ = > 154 \:$

AREA OF THE INNER CIRCLE = 154cm²

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AREA ENCLOSED BETWEEN THEM = AREA OF THE OUTER CIRCLE - AREA OF INNER CIRCLE

= 221.76 - 154

= 67.76cm²

HENCE THE AREA ENCLOSED BETWEEN TWO CONCENTRIC CIRCLE IS 67.76 cm²