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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: Solving for a Triangle's Area Using the Pythagorean Theorem 13 Views
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Description:
An isosceles triangle has legs 10 units long and a base 12 units long. What is its area in square units?
Transcript
- 00:02
All right sy mash my uppers next up and i
- 00:04
saw seles Triangle has legs thes things Ten units long
- 00:09
in a base Twelve units long What is its area
- 00:12
in square units All right Well let's See No reason
- 00:18
if you're triangles When in doubt draw a diagram The
Full Transcript
- 00:21
area the triangles one half the base times the height
- 00:24
In this situation we need to find height Well if
- 00:26
we imagine cutting the given triangle in half to form
- 00:29
two right triangles like this one here the height is
- 00:32
the vertical leg of each right triangle Well the horizontal
- 00:36
leg of each right triangle is half the base of
- 00:39
the original triangle Because of the whole cutting in half
- 00:42
thing they're so here check it out Looks like this
- 00:44
Get the ten thing in the ten thing in the
- 00:46
six there in the h there which is right Well
- 00:48
we'll use the pythagorean theorem to find age And yes
- 00:51
it was his best serum by far So we've got
- 00:54
a squared plus b squared c squared or six squared
- 00:56
Plus h squared is ten square Now simplify it That
- 00:59
gives us thirty six Plus h squared is one hundred
- 01:02
subtract thirty six from both sides We get sixty for
- 01:06
eight square to sixty four square to sixty four is
- 01:09
eight So the triangle is eight units tall in the
- 01:12
area of the original triangle then is one half base
- 01:16
times height right So it's a halftime twelve times eh
- 01:19
which is six times eight or forty eight square units
- 01:23
and note that we use the full base of the
- 01:25
original triangle there Twelve So that's it The answer is 00:01:29.552 --> [endTime] c forty eight or shmoop Uh
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