Question

Solve the unknown sides of the given triangle 19 A .09 a c 

          Solve the unknown sides of the given triangle
19
A
.09
a
c

Added by Emily F.

Precalculus with Limits
Precalculus with Limits
Ron Larson 2nd Edition
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Solve the unknown sides of the given triangle 19 A .09 a c
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Transcript

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00:01 Triangle with given dimensions and since all sides are given we are going to find or to solve for angles and we are going to use the law of cosine which states that cost a is equal to b squared plus c squared minus a squared divided by 2bc and substitution b is 7 so 7 squared is 49 plus c is 10 10 squared 100 minus a is 9 9 squared is 8 1 divided by 2 b c b and c is 7 times 10 which is 70 times 240 then from the calculator it's 49 plus 100 minus 8 .1 divided by 140, which gives us 0 .4 -877.
01:20 We can, to find a, then we can act cost.
01:29 We can add cost, 0 .4.
01:35 4 .4857 and this is going to give us 60 .94 degrees and to find b we can now use the sign rule so sign b over b and our b is 7 is equal to sign a which is 60 .94 divided by a, which is 9.
02:21 So, sign b is equal to 7...
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