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September 19, 2014

September 19, 2014

Posted by **Sandy** on Thursday, February 17, 2011 at 3:35pm.

- trig -
**Henry**, Saturday, February 19, 2011 at 7:26pmFirst, we draw a ver line which represents the tree and label it 80ft.

Then we draw a hor line to the base of

the tree. The other end of the hor line goes to the top of the tree and represents the hyp of a rt triangle.

Draw a 2nd hyp from the top of the tree

to a point on the hor line about 1/3 of

the distance to the bottom of the tree.

Label the segment between the 2 hyps

X1 and the segment connecting to the

bottom of the tree is X2.

The angle between the longest hyp and

hor line is 30 deg and the angle formed

by the shortest hyp is 60 deg.

tan30 = Y/(X1 + X2) = 80 / (X1 + X2),

X1 + X2 = 80 / tan30 = 138.6ft.

X2 = 80 / tan60 = 46.2ft.

X1 + X2 = 138.6,

X1 + 46.2 = 138.6,

X1 = 138.6 - 46.2 = 92.4ft. = Width of

the river.

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