Question

The diameter of the circle below is 42 cm. Work out the radius of the circle.​

Answer 1

Explaination :

Here we have been given with the diameter of a circle whose measure is of 42cm and we're asked to calculate radius.

★ As we know that :

• 
  `\boxed{ \sf{r \: = \: (d)/(2) }} \: \red\bigstar`

★ We have :

• diameter (d) = 42 cm
• radius (r) = ?

★ Applying the value of diameter in it :

`: \: \implies \: \sf{r \: = \: (42)/(2) } \\ \\ : \: \implies \: \sf{r \: = \: \cancel(42)/(2) } \\ \\ : \: \implies \: \blue{\bf{r \: = \: 21}}`

• 
  `\therefore \: \underline{\bf{Radius \: is \: of \: 21 \: cm}}`

Answer 2

r = 21 cm

Explanation:

The radius of a circle is 1/2 of the diameter

r = 1/2d

r = 1/2(42)

r = 21 cm