An angle = 6 = 1, the sum of 6 is 45 degrees, and the right angle of 90 degrees MINUS 45 degrees equals 45 degrees.

The four angles are similar to the top, and ninety degrees MINUS fifty degrees equals forty degrees.

A triangle and four angles form a right angle, and ninety degrees minus forty degrees equals fifty degrees.

Two angles and a triangle form a right angle, and 180 degrees MINUS 50 degrees equals 130 degrees.

1.45 degrees

440 degrees

350 degrees

2 130 degrees