ACT Problem The trapezoid below is divided into

ACT Problem The trapezoid below is divided into 2 triangles and 1 rectangle. Lengths are given in centimeters. What is the combined area, in square centimeters, of the 2 shaded triangles? A. B. C. D. E. 18 12 9 6 4

ACT Problem •

ACT Problem Going back: The trapezoid below is divided into 2 triangles and 1 rectangle. Lengths are given in centimeters. What is the combined area, in square centimeters, of the 2 shaded triangles? A. B. C. D. E. 18 12 9 6 4

Finding Missing Measures

Area of a Triangle Formula: Area = (1/2) (Base) (Height). 5*4*3 = 6 cm. 2

Area of a Parallelogram Formula Area = (Base) x (Height) 14*8 = 130 in. 2

Area of Trapezoid •

Finding Missing Measures 1) Plug in what you know and put an “x” for the missing part 2) Solve for x

Finding Missing Measures Triangle Example: A triangle has an area of 16 square centimeters and a height of 8 centimeters. What is the length of the base? (1/2) (Base) (Height) = Area of Triangle (. 5)*(x)*(8) = 16 4 x = 16 4 4 x = 4. So, the length is 8 centimeters.

Finding Missing Measures Parallelogram Example: A parallelogram has an area of 10 square inches and a base of 5 inches. What is the height? (Base) x (Height) = Area of Parallelogram (5)*(x) = 10 5 x = 10 5 5 x = 2. So, the height is 2 inches.

Finding Missing Measures •