 # Splash Screen. Lesson Menu Five-Minute Check (over Lesson 11–1) Main Idea Key Concept: Area of a Triangle Example 1:Find the Area of a Triangle Key Concept:

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Lesson Menu Five-Minute Check (over Lesson 11–1) Main Idea Key Concept: Area of a Triangle Example 1:Find the Area of a Triangle Key Concept: Area of a Trapezoid Example 2:Find the Area of a Trapezoid Example 3:Real-World Example

Main Idea/Vocabulary Find the areas of triangles and trapezoids.

KC 1

Example 1 Find the Area of a Triangle Find the area of the triangle below. A = 14.4Multiply. Estimate

Example 1 Find the Area of a Triangle Answer: The area of the triangle is 14.4 square centimeters.

1.A 2.B 3.C 4.D Example 1 A.10.5 ft 2 B.13.5 ft 2 C.21.75 ft 2 D.27 ft 2 Find the area of the triangle to the right.

KC 2 Interactive Lab: Area of Trapezoids

Example 2 Find the Area of a Trapezoid Find the area of the trapezoid below. The bases are 4 meters and 7.6 meters. The height is 3 meters.

Example 2 Find the Area of a Trapezoid Replace h with 3, b 1 with 4, and b 2 with 7.6. Answer: The area of the trapezoid is 17.4 square meters.

1.A 2.B 3.C 4.D Example 2 A.26.5 cm 2 B.60.5 cm 2 C.61.5 cm 2 D.73.5 cm 2 Find the area of the trapezoid to the right.

Example 3 GEOGRAPHY The shape of the state of Montana resembles a trapezoid. Find the approximate area of Montana.

Example 3 Answer: The area of Montana is about 145,493 square miles. Replace h with 285, b 1 with 542, and b 2 with 479.

1.A 2.B 3.C 4.D Example 3 A.75 ft 2 B.150 ft 2 C.300 ft 2 D.450 ft 2 PAINTING The diagram is of a canvas resembling a trapezoid that will be painted. In order to determine how much paint will be needed, estimate the area of the canvas in square feet.

End of the Lesson

Resources Five-Minute Check (over Lesson 11–1) Image Bank Math Tools Area of Trapezoids Drawing 3-D Figures Area of Polygons

1.A 2.B 3.C 4.D Five Minute Check 1 (over Lesson 11-1) A.209 in 2 B.198 in 2 C.99 in 2 D.60 in 2 Find the area of the parallelogram. Round to the nearest tenth if necessary.

1.A 2.B 3.C 4.D Five Minute Check 2 (over Lesson 11-1) A.19 yd 2 B.38 yd 2 C.42 yd 2 D.84 yd 2 Find the area of the parallelogram. Round to the nearest tenth if necessary.

1.A 2.B Five Minute Check 3 (over Lesson 11-1) Determine whether the following statement is true or false. The height of a parallelogram is the distance from the base to the opposite side. A.true B.false

1.A 2.B 3.C 4.D Five Minute Check 4 (over Lesson 11-1) A.28 cm B.32 cm C.31 cm D.30.5 cm What is the height of a parallelogram if the base is 24 centimeters and the area is 744 square centimeters?

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