1. Splash Screen

2. 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

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

4. KC 1

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

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

7. 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.

8. KC 2 Interactive Lab: Area of Trapezoids

9. 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.

10. 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.

11. 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.

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

13. 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.

14. 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.

15. End of the Lesson

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

17. 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.

18. 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.

19. 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

20. 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?

21. End of Custom Shows