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Find perimeter and area of triangle (precalc) question?

0 votes

How would you find the perimeter and area of Triangle ABC given Angle C=27 degrees, a=4, b=7.62 

I got 16.06 for perimeter and 6.75 for area, but it says that that is wrong??? Am i really close?? Am i just off by a few decimals??

asked Apr 16, 2016 in PRECALCULUS by anonymous

1 Answer

0 votes

Step 1:

The triangle sides are image and angle image.

The area of the triangle is: image.

Substitute the values image and angle image in image.

image

Use calculator substitute, image.

image

Area of the triangle is image.

Step 2:

Find image.

Use cosine law: image.

Substitute the values image and angle image in the cosine law.

image

The perimeter of the triangle: image.

Substitute the values image and image in image.

image

Perimeter of the triangle is image units.

Solution :

Area of the triangle is image.

Perimeter of the triangle is image units.

answered Apr 16, 2016 by Anney Mentor

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