Skip to Main Content

SOPHIA

SOPHIA

Calculating the Area of a Circle

Determining the Area of a Circle from the Radius

Ballparking the Area of a Circle

Ballparking the Area of a Circle

Rating:

(0)
(0)
(1)
(0)
(0)

Author:

Graham Pardun (282)

Objective:

This lesson explains how triangles and parallelograms can be used to estimate the area of a circle.

Ballparking the Area of a Circle

Pretend that we don't know the value of PI. Pretend that we don't know that the area of the circle is PI times the radius squared. How are we going to figure out the area anyway? Check this out: You can put six equilateral triangles inside of a circle and get a rough estimate for the circle's area using a genius hack!

open player in a new window

Please Rate This Tutorial

I want more like this

Pretty darned good

I've seen better

Questions and Answers

Academic Reviews

SOPHIA has reviewed the tutorial and found it academically sound.

Sophia Summer Rewards for College Readiness

Sophia Summer Rewards for College Readiness

Earn $250 in grants

for Sophia online college credit courses.

College Algebra

Are You Ready?

College Algebra

Take a College Prep Pathway for free & get ready for college level algebra.