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please help.

0 votes

asked Jan 25, 2015 in TRIGONOMETRY by anonymous

2 Answers

0 votes

7).

Step 1 :

In .

Law of cosines for : .

Substitute the values in above equation.

image

Step 2 :

Law of cosines for .

Substitute corresponding values.

image.

Step 3 :

Sum of the angles of a traingle is image.

image

Solution :

image, image and .

answered Jan 26, 2015 by lilly Expert
0 votes

8).

Step 1 :

In , and in.

Sum of the angles of a triangle is image.

Step 2 :

Law of sines :image.

Consider .

Substitute , and in above expression.

step 3 :

Consider image.

Substitute corresponding values in above equation.

Solution :

in, and in.

answered Jan 26, 2015 by lilly Expert
edited Jan 26, 2015 by lilly

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