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TSI Mathematics Videos 144 videos

TSI Math: Understanding Points of Intersection
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Two parabolas are graphed in the coordinate plane. Parabola A is a function, and parabola B is not a function. What is the maximum number of points...

TSI Math: Solving a Quadratic Equation for x
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What is x for the equation 2x² + 36 = -18x?

TSI Math: Finding a Line's x-Intercept Given a Point on that Line
4 Views

Which of the following points is a location where the function f(x) = -2x² + 12x + 54 crosses the horizontal axis?

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TSI Math: Using Circumference to Calculate a Circle's Area 45 Views


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Description:

A circle has an area of 225π square units. What is its circumference?


Transcript

00:02

Okay next up sai Math people Here we go A

00:04

circle has an area of two hundred twenty five pi

00:08

square units what's its circumference Okay if the radius of

00:16

a circle is our than its areas pyrrhus square don't

00:18

forget that radius thing Their pies around in this formula

00:21

is pi times are squared so we're given pi r

00:24

squared is to twenty five pie and weaken solve a

00:27

little bit so cross out pie on both sides and

00:30

we have our squared to twenty five So square root

00:33

of two twenty five is what yes fifteen Well the

00:36

circumference of a circle is its perimeter The formulas to

00:39

pie are there since we know that our is fifteen

00:41

we're good to go It's two pi r is two

00:44

pi times fifteen or thirty pie that's the circumference of

00:48

the circle thirty pie units and the answer is d 00:00:51.635 --> [endTime] there were shmoop circular lately

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