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Help how do i do this

Help how do i do this-example-1
User Shahnaz
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1 Answer

12 votes

Answer:

406.3 cm²

Explanation:

The total surface area is the sum of the base area and the lateral area. The lateral area is the sum of the areas of the 6 congruent triangular faces.

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lateral area

Each triangular face has a base of 8 cm and a slant height of 10 cm. Its area is ...

A = 1/2bh

A = 1/2(8 cm)(10 cm) = 40 cm²

Then the area of 6 faces is 6×40 cm² = 240 cm².

total area

The base area is given.

The total area is the sum of the lateral area and the base area:

total area = 240 cm² +166.3 cm² = 406.3 cm²

The surface area is about 406.3 cm².

User Rendy
by
7.5k points

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