Rotation preserves shape - therefore the angle before the rotation equals the angle after the rotation.
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You went 360o in the same direction, so you end up with a circle.
A 90 degree angle is a right angle
A right-angle is a 90 degree angleA right triangle has one, and a 90-degree angle isone.
Fifty degrees. 90+40+90=180
Hint: 90/2=...