Answer:
triangle - is a polygon with three edges and three vertices
perpendicular lines - are lines that intersect at a right (90 degrees) angle.
parallel lines - Parallel lines are equidistant lines (lines having equal distance from each other) that will never meet.
obtuse angle - has a measurement greater than 90 degrees but less than 180 degrees
intersecting lines - the intersection of a line and a line can be the empty set, a point, or a line
right angle - , a right angle is an angle of exactly 90° (degrees), corresponding to a quarter turn.
acute angle - An acute angle is an angle that measures less than 90 degrees.
quadrilateral - is a polygon in Euclidean plane geometry with four edges and four vertices
