Question

If the radius of a circle is 4.2 cm, compute its area and circumference.
Solution:
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Answer 1

Answer:

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Step-by-step explanation:

circumference = 2πr

• 2*3.14*4.2
• 26.376cm

Area = πr^2

• 3.14*(4.2)^2
• 55.39 sq.cm

Answer 2

Answer:

r=4.2 cm

area of a circle =

$\pi \: r {}^{2}$

therefore area= 22/7 *4.2 * 4.2

$= 55.44 {cm}^{2}$

now circumference

$= 2\pi \: r$

= 2*22/7*4.2

= 26.4cm