How do i learn how to do this math ? I don’t know how to do it

Both angles measure 135 degrees.

Step-by-step explanation:

There is an image below showing my work. Sorry about the crinkled paper. You set both equations equal to each other and solve for x. You can then substitute x in for what you got. This will work for either equation. Since the equations are equal you only have to substitute it in for one equation but can do both.

the answer is 288..

hope this

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2