Question

Find the circumference of a circle whose radius is 42 cm and also find its diameter​

Answer 1

Step-by-step explanation:

$\rm\red{QUESTION}$::

Find the circumference of a circle whose radius is 42 cm and also find its diameter

$\rm\red{ANSWER}$::

$c = 2\pi \: r \\ r = 42cm \\ \\ 2 \times \frac{22}{7} \times 42 \\ \\ = \frac{2 \times 22 \times 42}{7} \\ \\ = \frac{1848}{7} \\ \\ = 264cm {}^{2}$

Hence, circumference is

$264cm {}^{2}$

$d = 2r \\ = 2 \times 42 \\ = 84$

Answer 2

Answer:

Circumference of a circle of radius r =2πr

Circumference of circle of radius 42cm=2π×(42cm)

⇒2× 22 × 42

7

⇒264 cm