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Published byAileen Dean Modified over 5 years ago

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Do Now Write this down! Below are nets for 3D shapes. Identify the shape and find the area of the net 6cm 7 ft 10 ft

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Objectives To use nets of 3D figures to calculate total surface area and lateral surface area Benchmarks: B and C.3.4.1

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**Agenda Finish building 3D solids from nets**

Measure the pertinent parts of each solid Calculate the total surface area and lateral surface area of each solid Practice calculating surface area of prisms and pyramids

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**Definitions Surface area – sum of the areas of all the faces**

Write this down! Surface area – sum of the areas of all the faces Lateral surface area – sum of the areas of all the lateral faces Height – altitude of the solid Slant Height – the altitude of the lateral face

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**Finding Surface Area Draw and label the net of the solid**

Write this down! Draw and label the net of the solid Find the area of each face Sum all the areas

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Surface Area of a Prism Write this down! Use the net to find the lateral surface area and the total surface area of the prism below 4 12 3 5 cm 4 3 4 3 5 20 15 20 15 3 cm 3 12 4 cm 4 Lateral Surface Area = = 70 cm2 Total Surface Area = = 94 cm2

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**Surface Area of Pyramids**

Write this down! Use the net below to find the lateral surface area and total surface area of the square pyramid 10 11 11 in 10 in Lateral Surface Area = ½ (10)(11) x 4= 220 in2 Total Surface Area = = 320 in2

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**Finding Surface Area Draw and label the net of the solid**

Find the area of each face Sum all the areas

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Next Time Surface Area of “the Others” Volume

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