Angles on opposite sides of the transversal and between the parallel lines
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Alternate and interior angles are created between parallel lines when a transversal line cuts through them.
An angle sum is the sum (in degrees) of the particular angles you are measuring.
It means that the sides are of equal lengths and that the interior angles are of equal sizes
The term heptagon is derived from the latin "hepta" (which means seven) and "gon" (which means angle). Thus, a heptagon has seven interior angles (and seven exterior sides). Another term - septagon - means the same thing.
The word would be acute. You could refer to the triangle as an acute triangle. This means all angles measure less than 90 degrees.