Both are supplementary angles.




Answer:The length of a side is
9 cm
. The length of the diagonal is
12.73 cm.
Step-by-step explanation:
The answer is B. Use the trig identity (sin x)^2+(cos x)^2=1. Since cos x=0.3090, sinx=+-\sqrt(1^2-0.3090^2)=+-0.9511. Since 0<x<90, sin x must be positive, so sin x=0.9511. tan x=sin x/cos x=0.9511/0.3090=3.0780.
who knowsAnswer:
Step-by-step explanation: idk