Question

The radIiof two circles are 77 CM and 91 CM respecyltively how much longer is the circumference of the second circle than The first

Answer 1

Radii of two circles are 77 cm and 91 cm.

Too find which circle has longer circumference and by how much.

Solution :-

Circumference of a circle = 2πr

=> Circumference of first circle = 2 × 22/7 × 77

=> Circumference of first circle = 2 × 22 × 11

=> Circumference of first circle = 484 cm


Circumference of second circle = 2 × 22/7 × 91

=> Circumference of second circle = 2 × 22 × 13

=> Circumference of second circle = 572 cm

So, second circle has longer circumference by => 572 - 484 = 88 cm


Answer :- 88 cm

Answer 2

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Solution:-

Given:-

Radius of 1st Circle = 77cm.

Therefore, Circumference

$= > 2\pi \: r \\ \\ = > 2 \times \frac{22}{7} \times 77 \\ \\ = > 44 \times 11 \\ \\ = > 484 \: cm$

Now,

Radius of 2nd Circle = 91 cm.

Therefore, Circumference

$= > 2\pi \: r \\ \\ = > 2 \times \frac{22}{7} \times 91 \\ \\ = > 44 \times 13 \\ \\ = > 572cm$

Hence,

Difference Between the Second and First Circle's Circumference = 572 - 484

=> 88cm.