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maths the shape that is made where two straight lines join or cross each other. Angles are measured in degrees. An angle that measures 90 degrees is a right angle; if it is less than 90 degrees, it is an acute angle, and if it is more than 90 degrees, it is an obtuse angle.
two angles that together form a right angle
the angles opposite each other that are formed when two lines intersect (=cross each other)
maths the point that is opposite the base of a triangle
be reversed; be as if it had never happenedadd a word