MathVillage

Finding the perimeter of semi-circles using the formula $\large~P\,=\,\frac{\pi~d}{2}\,+\,d$.

Practice using $3\frac{1}{7}$ to find area and circumference.

Practice using 3.14 to find area and circumference

Teaser and introduction goes here. Sample problem here.

 This is the "title" page for the Circles book.

Finding the area of circles using the formula π • r • r

Watch this video to learn why the formula for the area of a circle is π • r • r.

Learn how to find the circumference of a circle if you know the measure of the circle's diameter. $$C\,=\,\pi~\cdot~d$$