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Number Cube Challenge Juanita and Clarissa have 4 number cubes and are having fun making up number games one afternoon. Clarissa has an idea for a new.

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Presentation on theme: "Number Cube Challenge Juanita and Clarissa have 4 number cubes and are having fun making up number games one afternoon. Clarissa has an idea for a new."— Presentation transcript:

1 Number Cube Challenge Juanita and Clarissa have 4 number cubes and are having fun making up number games one afternoon. Clarissa has an idea for a new game: Lets each pick a number you can roll with 2 number cubes. Then we'll each roll 20 times to try to get that number. The person who gets her number the most times wins. OK, says Juanita. I pick the number 12. And I choose 7, says Clarissa. Who is more likely to win the game? Why?

2 Clarissa is more likely to win because there are more ways to get 7 on the number cubes. 1+6 = = = 7 There is only one combination one the number cubes that will make Number Cube Challenge

3 Area of Triangles and Trapezoids Lesson 11-5

4 5 in 4 in What is the area of the parallelogram? Area = bxh A = 20 in²

5 A = 20 in² What happened to the parallelogram when we cut it in half? We now have two triangles. What would the area of one triangle be????????? What could we use as a formula to find the area of a triangle?

6 The area of a triangle is half of the area of a parallelogram. A = ½ bh h b Triangles

7 Find the Area of the Triangle 10m 6.5m A = ½ bh A = ½ (6.5m) x (10m) A = ½ (65m) A = 32.5 m²

8 Find the Area of the Triangle 11ft 14ft A = ½ bh A = ½ (14ft) x (11ft) A = ½ (154ft) A = 77 ft²

9 Find the Area of the Triangle 9.6mm 8mm A = ½ bh A = ½ (8mm) x (9.6mm) A = ½ (76.8mm) A = 38.4 mm²

10 Trapezoids A trapezoid has two bases, b and b. The height (h) of a trapezoid is the distance between the bases. A = ½ h( b + b ) 12 b 1 b 2 h 12

11 Find the Area of the Trapezoid 5 in 12 in 7 in A = ½ h( b + b ) A = ½ (7in)(5in +12in) A = ½ (7in)(17in) A = ½ (119in) A = 59.5 in² 12

12 Find the Area of the Trapezoid 7 ft 15.6 ft 8 ft A = ½ h( b + b ) A = ½ (8ft)(7ft +15.6ft) A = ½ (8ft)(22.6ft) A = ½ (180.8ft) A = 90.4 ft² 12

13 The area of a triangle is half of the area of a parallelogram. A = ½ bh h b Triangles

14 Trapezoids A trapezoid has two bases, b and b. The height (h) of a trapezoid is the distance between the bases. A = ½ h( b + b ) 12 b 1 b 2 h 12

15 Dont Forget Homework: Lesson 11-5 # 2-14 evens


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