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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?
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
Full Transcript
- 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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