Question

What is the length of the portion BC of the cloth?

Answer 1

Cos?

Answer 2

For this question you would have use sine not cos

\[\sin 38= BC \div 5\]

BC= 5*sin38

Sin 38=0.6156
BC= 5*0.6156
BC=3.078

Therfefore the length of cloth is =3.078

Answer 3

5/sin 38?

Answer 4

No 5 multiplied by sin 38

Answer 5

Ohhh alright i see

Answer 6

Look it is fairly simple \[\sin \theta\] of any angle is given by perpendicular divided by hypotenuse in this your perpendicular is BC and hypotenuse is AC so just multiply sin 38 by 5 and you have your answer

Answer 7

Okay let's clear this once and for all, I think you have trouble understanding which one we call the base, and which is the altitude, whicle assuming sin, tan and cos in trigo.


1. THE HYPOTENUSE - this is the longest side - always OPPOSITE TO THE RIGHT ANGLE.
2. ALTITUDE - The side opposite to the right angle, which DOES NOT CONTAIN THE CONTAIN THETA.
3. BASE - side containing the angle theta!!

\[sin(\theta) = \frac {altitude}{hypotenuse.}\]