A right trapezoid.
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There are 60 minutes of angle in one degree of angle.
A right-angle is a 90 degree angleA right triangle has one, and a 90-degree angle isone.
Into minutes, then seconds. A 1 degree angle is 60", 0' or, a 1 degree angle can be expressed as 0", 3600' a .5 degree angle can be expressed as 30", and so on.
An acute angle because it's greater than 0 but less than 90 degrees
One half of a right angle is a 45 degree angle.