1) Angle- the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet. 2) Right Triangle- A triangle with one right angle 3) Acute Triangle- A triangle with all three interior angles being acute 4) Isosceles Triangle- A triangle with two sides that are equal in length 5) Equilateral Triangle- A triangle where all sides are equal in length 6) Line Segment- A section of a line bounded by two points or connecting two points. 7) Collinear Points- Points that lie on the same line 8) Parallel Lines- Two lines lie in the same plane and never intersect  9) Skew Lines- Two lines that do not intersect because they do not lie in the same plane 10) Quadrilateral- A shape with exactly 4 sides 11) Trapezoid-  A quadrilateral with only one pair of parallel sides 12) Rhombus- A parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides  13) Square- A quadrilateral with four equal sides and four right angles 14) Heptagon- A plane figure with seven straight sides and angles. 15) Octagon- A shape with 8 sides and 8 angles

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