Mathematics: Find the surface area to the nearest whole number

Find the surface area to the nearest whole number

Ответ:

bbby2

11.01.2022

Mathematics

The surface area is $180\ m^{2}$

Step-by-step explanation:

we know that

The surface area of the composite figure is equal to the area of its four lateral triangular faces of the pyramid in the top plus the lateral area of the prism plus the area of the base of the prism

$SA=4[\frac{1}{2}(4)(l)]+(4+4+4+4)(8)+4^{2}$

SA=8l+144

Find the slant height (l) of the pyramid

Applying the Pythagoras Theorem

$l^{2}=(b/2)^{2}+h^{2}$

we have

$b=4\ m$

$h=4\ m$

substitute

$l^{2}=(4/2)^{2}+4^{2}$

$l^{2}=20$

$l=\sqrt{20}\ m$

Find the surface area

SA=8l+144

$SA=8(\sqrt{20})+144=180\ m^{2}$

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Ответ:

3steves

24.07.2021

Mathematics

30 waiters

Step-by-step explanation:

the ratio of 5 waiters to 2 cooks

you are given the total number of waiters and cooks = 42

write equation

x (5 + 2) = 42

7x = 42

x = 6

now distribute the x into waiters which is 5x or 5(6) = 30 waiters

additionally 2x is for cooks or 2(6) = 12 cooks; which adds up to 42

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Find the surface area to the nearest whole number

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