6.3 Area of a Trapezoid Mme DiMarco

 Learning Goal: use a formula to find the area of a trapezoid Learning Goal

 Trapezoid: a quadrilateral that has at least one pair of parallel sides  RECALL  a rectangle, square and parallelogram are also trapezoids! Trapezoid > >

Method 1: 1.Divide the trapezoid into smaller shapes (triangle A, rectangle B and triangle C) 1.Find the area of each shape 2.Add the areas together to find the trapezoid area To calculate the area of a trapezoid… B > > A C Trapezoid Area = Area of Triangle A + Area of Triangle B + Area of Triangle C

Method 2: use a formula A t = (b 1 + b 2 ) x h 2 To calculate the area of a trapezoid… > > b1b1 b2b2 h

Use the formula to find the area of the trapezoid A t = (b 1 + b 2 ) x h 2 A = (12 + 9) x 4 2 A = 21 x 4 2 A = 84 2 A = 42 cm 2 Example

 Page 228, questions #1 - 5a, 8 Homework