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# 2D Geometry

### Shapes, perimeter, and area

Area the number of square tiles that can fit on the inside of a shape
Perimeter the distance around the edge of a shape; pe(rim)eter
Complementary Angles two angles that total 90 degrees when added together
Supplementary Angles two angles that total 180 degrees when added together
Right Scalene Triangle a triangle with one right angle and two acute angles. three sides with different lengths and three angles with different measures.
Right Isosceles Triangle a triangle with one right angle and two acute angles. two equal sides and two equal angles.
Acute Equilateral Triangle a triangle with three acute angles each measuring 60 degrees and three equal sides
Acute Isosceles Triangle a triangle with three acute angles. two equal sides and two equal angles.
Acute Scalene Triangle a triangle with three acute angles. three sides with different lengths and three angles with different measures
Obtuse Isosceles Triangle a triangle with one obtuse angle and two acute angles. two equal sides and two equal angles.
Obtuse Scalene Triangle a triangle with one obtuse angle and two acute angles. three sides with different lengths and three angles with different measures.
Square four equal sides. four 90 degree angles
Rhombus four equal sides. opposite angles equal.
Rectangle four 90 degree angles. opposite sides equal.
Parallelogram two sets of parallel sides. opposite sides equal. opposite angles equal.
Trapezoid one set of parallel sides.
Polygon a shape with no gaps. made of straight lines.
Sum of Angles in a Triangle 180 degrees
Sum of Angles in a Quadrilateral 360 degrees
Area Formula for a Square s x s
Area Formula for a Rectangle l x w or b x h
Area Formula for a Parallelogram b x h
Area Formula for a Triangle b x h / 2
Area Formula for a Trapezoid (base one + base two) x h / 2
Base flat bottom side that shape sits on
Height straight line from top of shape to the bottom. makes right angle with base.
Created by: l0803220