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Main Idea/Vocabulary regular pyramid slant height Find the lateral and total surface areas of pyramids.

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Presentation on theme: "Main Idea/Vocabulary regular pyramid slant height Find the lateral and total surface areas of pyramids."— Presentation transcript:

1 Main Idea/Vocabulary regular pyramid slant height Find the lateral and total surface areas of pyramids.

2 KC

3 Example 1 Surface Areas of a Pyramid Find the lateral and total surface areas of the triangular pyramid. Find the lateral area and the area of the base. Area of each lateral face Area of a triangle Replace b with 5 and h with 8.

4 Example 1 Surface Areas of a Pyramid There are 3 faces, so the lateral area is 3(20) or 60 square inches. A = 10.8 in 2 Answer:The lateral surface area of the pyramid is 60 square inches. The total surface area is or 70.8 square inches. Area of base

5 1.A 2.B 3.C 4.D Example 1 A.156 cm 2 B.174 cm 2 C.182 cm 2 D.204 cm 2 Find the total surface area of the square pyramid.

6 Example 2 TOYS A toy block has the shape of a regular pyramid with a square base. The manufacturer wants to paint the lateral surface green. How many square centimeters will be painted green? Answer: The lateral surface area is 112 square centimeters. Lateral surface area of a pyramid Simplify. P = 7(4) or 28 and = 8

7 1.A 2.B 3.C 4.D Example 2 A.175 cm 2 B.210 cm 2 C.235 cm 2 D.260 cm 2 TOYS A toy block has the shape of a regular pyramid with a square base. The manufacturer wants to paint the lateral surface green. How many square centimeters will be painted green?

8 1.A 2.B 3.C 4.D Five Minute Check 1 A yd 2 B yd 2 C yd 2 D.58.1 yd 2 Find the surface area of the given solid. Round to the nearest tenth if necessary. (over Lesson 7-7)

9 1.A 2.B 3.C 4.D Five Minute Check 2 A.108 ft 2 B.114 ft 2 C.120 ft 2 D.132 ft 2 Find the surface area of the given solid. Round to the nearest tenth if necessary. (over Lesson 7-7)

10 1.A 2.B 3.C 4.D Five Minute Check 3 A.1,442.9 m 2 B m 2 C m 2 D m 2 Find the surface area of the given solid. Round to the nearest tenth if necessary. (over Lesson 7-7)

11 1.A 2.B 3.C 4.D Five Minute Check 4 A.90.6 in 2 B in 2 C in 2 D.1,890.5 in 2 Find the surface area of a cylinder with diameter 14.5 in and height 6.25 in. Round to the nearest tenth if necessary. (over Lesson 7-7)

12 1.A 2.B 3.C 4.D Five Minute Check 5 A.50 cm 2 B.106 cm 2 C.120 cm 2 D.212 cm 2 Find the surface area of a rectangular prism with length 20 cm, width 3 cm, and height 2 cm. Round to the nearest tenth if necessary. (over Lesson 7-7)

13 1.A 2.B 3.C 4.D Five Minute Check 6 A.62.8 in 2 B.89.5 in 2 C.94.2 in 2 D in 2 Jeffrey bought his father a can of tennis balls for his birthday. Jeffrey wants to wrap the can in wrapping paper. If the can has a height of 8.5 inches and a radius of 1.5 inches, how much wrapping paper will Jeffrey need? (over Lesson 7-7)

14 End of Custom Shows


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