Question

anyone good in geometry?​

Answer 1

The sum of the 3 outside angles of a triangle equal 360 degrees.

Add the equations together to equal 360:

x+8 + x +20 + 2x +12 = 360

Combine the like terms on the left side of the equal sign:

4x + 40 = 360

Subtract 40 from both sides:

4x = 320

Divide both sides by 4:

x = 80

Answer 2

Answer:

I am not 100%, but I think it is x=82

Step-by-step explanation:

x + 8 is a right triangle, so 82 + 8 = 90