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Zolol [24]
3 years ago
5

What is the measurement of BC?

Mathematics
2 answers:
vichka [17]3 years ago
7 0

Answer:

4.45

180 - 70 - 90 = 20

By Law of Sines

13/sin90 = BC/sin20

BC = 4.45

Sin90 = 1

son4ous [18]3 years ago
4 0

Answer:

             BC=4.42

Step-by-step explanation:

In, given figure:

        AB=13

        ∠B=70°

we have to find BC ?

as,      

              cosA=\frac{Base}{Hypotenuse} \\\\

Given cos(70°)≈0.34

                     cos(70°)   =\frac{BC}{AB}

               

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

The measurement of BC is

             BC=4.42

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