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If the angle is larger than a right angle it is obtuse
An acute angle is smaller than a right angle.An obtuse angle is larger than a right angle.^_^
When lines met or cross at a right angle are perpendicular lines.
I generally use a pencil and ruler. To construct the right angle to draw it I also use compasses. To measure the right angle to draw it I also use a protractor.
If 2 sides are known then use Pythagoras' theorem to find the 3rd side of a right angle triangle.