How do you find the Perimeter of a circumscribed polygon?

Answer 1

P = I ( 1 + y'^2 )^1/2 dx

Where: I - Integral (from point a to point b)

suppose the circle is x^2 +y^2 + a^2

the perimetr will be 4 times the perimeter in the first quadrant

now take a small element

ds on the curve

by Pythagoras theorm

ds2 = dx2 + dy2

now rearange

to get the formula on top

Answer 2

To find the area you multiply pi (3.14) by the radius and then multiply your answer by the radius again. For example:

Say the radius is 10cm. You would go 3.14x10x10.

IMPORTANT: 3.14xr2

is different than 3.14xrx2!

Also, if you have the circumference of the circle but need the radius, just divide the circumference by 2.

Hope this helps!

Answer 3

find the other side of an circumscribed polygon , 8,10,21?