find bc. round to the nearest tenth. a. 19.1 b. 20.8 c. 23.1 d. 23.3

We can use the sine rule for this problem.

Sine rule formula is:

Where a (side BC), b (side AC) and c (side AB) are the opposite sides of the angle A, B and C repectively.

According to the given figure,

B= 79°, C = 30° and AB= c =11 and we need to find side BC= a.

Hence, first step is to find the angle A.

Sum of all angles of a triangle is 180°.

So, ∠A +∠B + ∠C = 180.

∠A + 79 + 30 = 180

∠A + 109 = 180

∠A = 180 - 109

∠A = 71°.

So, let's use the formula:

So, a = 20.801

Therefor BC is 20.8 ( Rounded to nearest tenth).

"Hope this helps!!"

38.6°

step-by-step explanation:

resultant is 10 pound

smaller force = 8 pound

angle formed = tan⁻¹(

                        =tan⁻¹(

                          =tan⁻¹(0.8)

                        =38.6°