how do i determine the height of a triangle with only the length nd sides?

- anonymous

how do i determine the height of a triangle with only the length nd sides?

- jamiebookeater

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- anonymous

The base of the tent measures 96 inches wide, and the length from the top point of the tent to the corners of the base is 102 inches.

- anonymous

What is the length of the pole that Daniel needs to support the middle of the tent?

- anonymous

Use pythagoras' theorem :)

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## More answers

- anonymous

how do u suppose i do dat?

- anonymous

imagine a line from the top point to the middle of the base. You now have two right angled triangles. Use pythagoras' theorem on one to find the height (the line you've drawn in)
a^2+b^2=c^2
a=96/2=48
b=the height
c=102
48^2+b^2=102^2
2304+b^2=10404
b^2=10404-2304=8100
b=sqrt(8100)
b=90

- anonymous

A. 72 inches
B. 180 inches
C. 96 inches
D. 90 inches

- anonymous

b=90, so b is answer D! Do you understand it?

- anonymous

##### 1 Attachment

- anonymous

use pythagoras' theorem again.
in this case:
a=sqrt(40)
b=3
c=z on the diagram
so:
sqrt(40)^2+3^2=c^2
40+9=c^2
49=c^2
c=sqrt(49)
c=7
:)

- anonymous

##### 1 Attachment

- anonymous

are you actually understanding this or just taking the answers? if you're learning you should be able to work this out now. remember, for right angled triangles, just use pythagoras' theorem!

- anonymous

you there?

- anonymous

im having trouble with the squareroot part

- anonymous

what exactly do you mean? :)

- anonymous

\[\sqrt{15}\]

- anonymous

are you doing the question you attached? how does the sqrt(15) come into it?

- anonymous

im doing em i just dont understand em

- anonymous

so you are doing the attached one?
do you know pythagoras' theorem?

- anonymous

yes and yes a^2+b^2=c^2

- anonymous

correct :) in this case you need to find a, so rearrange the equation so that a is by itself

- anonymous

but the square root how do i figure that

- anonymous

when you rearrange, the equation is:
a^2=c^2-b^2
i think you mean sqrt(53)=z?
In pythagoras' theorem, the z is the equivalent of c because it is the hypotenuse, so you subsitute this into the equation:
a^2=sqrt(53)^2-b^2
when you square a square root, you're basically just getting rid of the square root, so sqrt(53)^2=53
does that help?

- anonymous

yes

- anonymous

good, so you can answer the question now? :)

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