Question

What is the measurement of BC?

Answer 1

180 - 90 - 70 = 20

13/sin90 = BC / sin20

BC = 4.45

Answer 2

`BC=4.42`

Explanation:

Given:

∠B=70°

AB=13

cos(B°)=
`(Base)/(Hypotenuse)`

cos(70°)=
`(BC)/(13)`

Given: cos(70°)≈0.34

`0.34=(BC)/(13) \\\\BC=0.34*13\\\\BC=4.42`

The measurement of BC is

`BC=4.42`