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How do you find the missing side of a right triangle using sin cos tan?
 Dec 20, 2013
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Kerri:

How do you find the missing side of a right triangle using sin cos tan?



first you draw a right angled triangle and mark the right angle.
now mark the other angle that you know and the side that you know.
now pick up a different coloured pen.
Us it to
put H on the hypotenuse.
put coloured dot on the vertex of the angle that you know
one of the sides touching that dot is the hypotenuse, the other is the adjacent side (adjacent means next to - the house that is adjacent to your house will share a common fence.)
Put an A on the adjacent side.
The other side, that doen't touch the dot is the opposite side (The house opposite yours is on the other side of the street, it does not touch your property.)
Put an O on the opposite side.
now, you have 1 side and you want to find another side so you care about those 2 sides. The third side you don't have and you don't want so it doesn't matter.
Put a circle around the letter on the 2 sides that you care about.

Now choose the ratio that uses those 2 sides

if you remember this it will help
some old hags sin(theta)=o/h
cant always hide cos(theta)=adj/hyp
their old age tan(theta)=opp/adj

Or maybe you will use
SOH CAH TOA
to help you remember.

Make up an equation and then solve it to find the side.
 Dec 20, 2013

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