Posted by **y912f** on Wednesday, January 7, 2009 at 6:30pm.

please check my answers.

1.Find the area of the sector of a circle.

r=11.8cm, theta-pi/7 radians

I got 31.2cmsquared

2.Find the radius of a circle in which a central angle of pi/6radian determines a sector of area 76square meters.

I got 17.03m

3.Find the measure(in radians) of a central angle of a sector of area 45 square inches in a circle of radius 8 inches.

I need help getting the answer

4.In this question you're suppose to approximate the length by finding the necessary arc length.

A tree 520m away subtends an angle of 4degrees. find the height of the tree.

I also need help on this one

THANKS ALOT

- trigonometry -
**Damon**, Wednesday, January 7, 2009 at 6:44pm
1. 31.24 yes

2.17.04 yes

3. total area = pi r^2 = pi(64)

angle/2pi =45/64 pi

angle = 45/32 = 1.41 radians = 80.6 degrees

4. r = 520

circumference = 2 pi (520) = 3267

4/360 = height/3267

height = 36.3

- trigonometry -
**y912f**, Wednesday, January 7, 2009 at 6:50pm
Thanks so much; This was of great help!

=D

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