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ki77a [65]
2 years ago
5

What is the measurement of BC?

Mathematics
2 answers:
irinina [24]2 years ago
6 0

Answer:

                      BC=4.42        

Step-by-step explanation:

Given:

         ∠B=70°

       AB=13

cos(B°)=  \frac{Base}{Hypotenuse}

cos(70°)= \frac{BC}{13}

Given:     cos(70°)≈0.34

                        0.34=\frac{BC}{13} \\\\BC=0.34*13\\\\BC=4.42

The measurement of BC is

                    BC=4.42

galina1969 [7]2 years ago
5 0

Answer:

180 - 90 - 70 = 20

13/sin90 = BC / sin20

BC = 4.45

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