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katrin2010 [14]
3 years ago
15

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

Mathematics
1 answer:
Tanzania [10]3 years ago
6 0

Answer:

C

Step-by-step explanation:

Using the Sine rule in Δ ABC

Calculate the measure of ∠ C

∠ C = 180° - (64 + 85)° = 180° - 149° = 31° , then

\frac{sin31}{9.3} = \frac{sin85}{b} → C

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To divide fractions, write the divison as multiplication by the reciprocal of the divisor :
a - 3     3 - a       a - 3        21  —————  ÷  —————   =   —————  •  ———————  7        21           7       (3 - a)
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