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Which proportion could be used to find the length of side b?

Which proportion could be used to find the length of side b?-example-1
User AshMan
by
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2 Answers

4 votes

the correct answer would be D

User Bartimar
by
7.6k points
5 votes

Answer:

D sin 85 sin 31

---------- = ----------

b 9.3

Explanation:

We can use the law of sins

sin B sin A sin C

---------- = ----------- = ----------

b a c

We do not know angle C, but we can calculate it

The angles of a triangle add to 180

A + B + C = 180

64+ 85 + C = 180

149 + C = 180

C = 180-149

C =31

sin B sin C

---------- = ----------

b c

We know B = 85, C = 31, b = unknown and c = 9.3

sin 85 sin 31

---------- = ----------

b 9.3

User Phil Evans
by
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