Presentation on theme: "Finding the area of a Trapezoid"— Presentation transcript:
1 Finding the area of a Trapezoid SWBAT find the area of a trapezoid by decomposing it into two triangles and using the formula.
2 Do Now1. What is the formula for the area of a rectangle? Provide an example.2. What is the formula for the area of a parallelogram? Provide an example.3. What is the formula for the area of a triangle? Provide an example.
3 Vocabulary-Trapezoid: a 4-sided flat shape with straight sides that has a pair of opposite sides parallel.- Decomposing: breaking a shape up into two other shapes (Ex: a trapezoid into 2 triangles)Review:What does parallel mean?How do we measure height?
4 Area of a TrapezoidDraw a diagonal line to break the trapezoid into two triangles.Find the area of each triangleAdd the area of each triangle togetherSee the diagram below.10 in12 in5 in
5 click to revealExample.Find the area of the figure by drawing a diagonal and splitting it into two triangles.12 cm10 cm11 cm9 cm12 cm10 cm11 cm9 cm
6 The Area (A) of a trapezoid is also found by using the formula: Note: The base & height always form a right angle!10 in12 in5 in
7 Find the area of the figures using the formula. Try These.Find the area of the figures using the formula.12 ft108 ft7 ft8 ft768139 ftclick to revealclick to reveal
8 Exit Ticket:Explain in words two methods to find the area of a trapezoid. Include visuals.