Question

What is the measurement of BC?

Answer 1

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

                    $BC=4.42$

Answer 2

Answer:

180 - 90 - 70 = 20

13/sin90 = BC / sin20

BC = 4.45