183k views
17 votes
How to do the circumference of a semicircle with a radius of 7 1/2.

2 Answers

4 votes
  • Radius=r=7.5units

Circumference

  • πr+2r
  • r(π+2)
  • 7.5(3.14+2)
  • 7.5(5.14)
  • 38.6units²
User John Geliberte
by
8.4k points
3 votes

Answer:

38.6 units (nearest tenth)

Explanation:

Formulae

  • Diameter = 2r
  • Circumference = 2πr

(where r is the radius)

Circumference of a semicircle = diameter + half the circumference

⇒ Circumference of a semicircle = 2r + πr

Given:


  • \sf radius\:{(r)=7\frac12=7.5


\begin{aligned}\implies \textsf{Circumference of semicircle} & = 2(7.5) + \pi(7.5)\\ & = 15+7.5 \pi\\ & = 38.5619449...\\ & = 38.6\:\sf units\:(nearest\:tenth)\end{aligned}

User Mcemilg
by
7.7k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories