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Measurement (Linear, Area, Three-Dimensional) Videos 10 videos
A cardboard box measures 12 inches wide, 8 inches across, and 6 inches tall. What is its volume in cubic feet?
An isosceles triangle has legs 10 units long and a base 12 units long. What is its area in square units?
A circle has an area of 225π square units. What is its circumference?
TSI Math: Finding the Area of a Regular Polygon 17 Views
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Description:
A regular polygon has apothem lengths of 9, side lengths of 3, and 12 sides. What is the area for this shape?
Transcript
- 00:02
Simon shmoop er's Here we go A regular polygon has
- 00:05
a possum Lengths of nine side lengths of three and
- 00:10
twelve sides what's the area for this shape Well breaking
- 00:18
the mold might be what makes some math famous But
- 00:22
when it comes to regular polygons you do not want
Full Transcript
- 00:25
to break the mold In fact regular polygons give the
- 00:28
side eye to anything that's not regular Lucky for us
- 00:31
we're working with a regular polygon because it means that
- 00:33
we confined the area using our trusty area of a
- 00:36
regular polygon formula And of course our brilliant brains So
- 00:41
let's see the formula for the area of a regular
- 00:42
polygon is a equals one half and s are where
- 00:45
n is the number of sides ass equals the side
- 00:48
length and our equals the possum length Well we've been
- 00:51
given the values of all these variables Eso all we
- 00:54
have to do is substitute them into the formula do
- 00:57
some math and and high five each other Yeah So
- 01:00
let's All right so we got a equals one half
- 01:02
and sa and that's one half times twelve times through
- 01:04
unit times nine units and altogether gets us one hundred
- 01:07
sixty two square units And easy spot for error is
- 01:10
forgetting to divide by half here like a did or
- 01:13
casually multiplying by two instead of dividing by it like
- 01:16
you see But anyway that's it The answer is b 00:01:18.718 --> [endTime] one sixty two square units and we are sure
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