Angles are measured by degrees. A complete rotation (which brings you back to the place you started from) is 360o. A straight line is equivalent to an angle of 180o(or half of a complete rotation). A right angle, such as you find in the interior corner of a square, is 90o.
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A right angle is a 90 degree angle.
Straight angle, which is 180 degree, obtuse angle, which is 179 degree to 91 degree, right angle, which is 90 degree, and acute angle, which is 89 degree to 1 degree.
Depends on what you mean by compliment. If its the compliment to a 90 degree angle it would be 42 degrees.
If shapes are equal then they are said to be congruent
That's the formula for the area of a circle.