Can someone plz help me with this I’m not understanding this
(The answer is not b)

D.  m = 20 , n = 10.

Step-by-step explanation:

The sine of 60 is √3/2, so

sin 60 =  10√3 / m = √3/2

√3 m = 20 √3

Divide both sides by √3:

m = 20.

cos 60 = 1/2 =  n / 20

2n = 20

so n = 10.

rectangle: 9 1/8 x 4 1/9 = 37 37/72in

parallelogram: b times h= 10.3 x 6.2 = 63.86

trapezoid: a+b/2 times h= 42.5

volume of prism: l times w times h= 36