Question

the radius of two concentric circle are 9 cm and 12 cm respectively find the area of the circular path between the two circle.​

Answer 1

Answer:

area of circle = Pia r square of first circle + second circle area. Explanation: Pia ( 9*2 + 12*2)= 22/7 (81 +144)= 22/7 *15 = 330/7.

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Answer 2

Answer:

198cm²

Step-by-step explanation:

Simple formula for these type of questions is:

$\pi((r1 + r2)(r1 - r2))$

where, r1 = bigger radius and r2 = smaller radius.

Therefore,

$\frac{22}{7} ((12 + 9)(12 - 9))$

$= \frac{22}{7} ((21) \times (3))$

$= \frac{22}{7} \times 63$

$= 22 \times 9$

$= 198$

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