Presentation on theme: "Working with Shapes in Two Dimensions"— Presentation transcript:
1 Working with Shapes in Two Dimensions Two-Dimensional Objects
2 Perimeter The distance around a figure. Think of perimeter as the distance you would travel if you walked around the edge of the figure.To find the perimeter, add the lengths of the sides of the figure.
3 AreaWhen working with flat figures you can calculate how much surface is enclosed within the boundaries.Area is measured with square units: such as square inches, square feet, and square meters.Formulas are used to calculate total area of a figure.
4 RectangleHas four sides and four right angles. Opposite sides of each pair are parallel and the same length.To calculate the area of a rectangle multiply the length times the width.l x w
5 SquareA square has 4 sides, all the same length, and four right angles. Opposites sides of each pair are parallel.To calculate the area of a square multiply the length of one side times itself(side squared)
6 ParallelogramHas four sides. Opposite sides of each pair are parallel and the same length.To calculate the area of a parallelogram multiply base times the height.b x h
7 Right Triangle Triangle has three sides with one right angle. To calculate the area of a triangle, multiply one-half times the length of the base times the height.1/2bh
8 Trapezoid Has four sides. Only one pair has parallel opposite sides. To calculate the area of a trapezoid multiple ½, add the bases, and multiply by the height.½ (b1 + b2)h
9 CircleA circle is formed by points that are all the same distance away from a certain pointTo calculate the area of a circle multiply pi times radius squared.Pi(r)2