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Tju [1.3M]
3 years ago
8

Please help me find the surface area of these both

Mathematics
1 answer:
klio [65]3 years ago
5 0

The formula to find surface area is SA= 2(L×W + L×H + H×W)

The 2 is there to double each side.

so..

A)

SA = 2(L×W + L×H + H×W)

= 2( 16×9 + 16×4 + 4×9)

= 2( 144 + 64 + 36)

= 2( 244)

= 488 units2

B) SA = 2(L×W + L×H + H×W)

= 2 ( 13×9 + 13×4 + 4×9)

=2 ( 117 + 52 + 36)

=2 ( 205)

SA= 410cm2

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Step-by-step explanation:

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MOE_{95} = 1.192\cdot MOE_{90}

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MOE=z_{\alpha/2}\cdot\frac{\sigma}{\sqrt{n}}

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*Use a <em>z</em>-table.

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Compare the MOE for 95% confidence level and 90% confidence level as follows:

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Step-by-step explanation:

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The total surface area = area of rectangular base + area of 2 isosceles triangles with a base of 24 units + area of 2 isosceles triangles with a base of 10 units.

Area of rectangular base = 24*10 = 240 sq units.

The slant height of isosceles triangles with a base of 24 units = [(10/2)^2+13^2]^0.5 = [25+169]^0.5 = 194^0.5 = 13.92838828 units.

The area of 2 isosceles triangles with a base of 24 units 2*24*13.92838828/2 = 334.2813187 sq units.

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