Question

circumference of a circle of radius '3r' is_____ units. Class 8 .maths

Answer 1

radius = 3

circumference of circls = 2×pie×r

=2×22/7×3

=18.85

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Answer 2

Answer:

Circumference of circle is 18.8r units

Step-by-step explanation:

Given that

Radius of circle is 3r

To find

Circumference of circle

Solution

Let

C is circumference of circle

r1 as radius of circle

As we know that

$c = 2 \times \pi \times r1$

we know

$\pi = \frac{22}{7}$

hence

$c = 2 \times \frac{22}{7} \times 3r$

by multiplication we get

$c = 18.8r \: units$

Hence circumference of circle is 18.8r unit.