Question

The radius of a semicircle is 3 kilometres. What is the semicircle's perimeter?

Answer 1

In terms of Pi:
`3\pi + 6` km

Exact value (rounded): 15.42477 km

Approximated (3.14): 15.42 km

Explanation:

Hello!

A semicircle's perimeter can be found using the formula:
`P = \pi r + 2r`

We can plug in the values to solve for the perimeter.

Solve

• 
  `P = \pi r + 2r`
• 
  `P = \pi(3)+ 2(3)`
• 
  `P = 3\pi + 6`

In terms of Pi, it is
`3\pi + 6`,

Exact value of Pi, it is 15.42477

Approximation of Pi (3.14), it is = 15.42