Find the missing side or angle. Round to the nearest tenth.
A=42°
a=22
b=12
B=[ ? Jº
Enter

i believe

step-by-step explanation:

from my conclusion c

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4