Zero = null
Zero to 90 = acute
90 = right
90 to 180 = obtuse
180 = straight
180 to 360 = reflex
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It is a right angle triangle because it has a 90 degree angle and the 3 angles add up to 180 degrees.
False because the 3rd angle has to be a right angle of 90 degrees because the 3 angles of any triangle add up to 180 degrees.
A protractor is used for measuring angles and the 3 angles in a triangle add up to 180 degrees.
When the clock is at 3 o'clock, the hands form a right angle which measures 90 degrees.
An equilateral triangle, which has 3 angles of 60o.