Friday

December 19, 2014

December 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.

**Answer this Question**

**Related Questions**

trigonometry - An aeroplane at an altitude of 200m observes the angles of ...

math - Two boys are on opposite sides of a tower.They sight the top of the tower...

maths --plse help me.. - THERE IS A SMALL ISLAND IN THE MIDDLE OF A 100M WIDE ...

math trig - two points A and Bare 80 feetapart on the same side of A towerand on...

MATHS - TWO OPPOSITE ANGLES OF A PARALLELOGRAM ARE (3X-2)DEGREE AND (50-X)DEGREE...

geometry - find the value of x in each triangle: triangle x has 1 angle at 53 ...

geometry - find the value of x in each triangle: triangle x has 1 angle at 53 ...

Math - Two dogs are 180 ft apart on opposite sides of a tree. The angles of ...

trig - From the top of a hill 700 ft. high, an observer notes that the angles of...

Math - I have four sides. I have two 70 degree angles and two 110 degree angles...