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3 years ago

15

A model of a 39 foot tall building was made by using the scale 1 in : 4.5 feet. What is the height of the model? Round your answ

er to the nearest tenth

1 answer:

Gnom [1K]3 years ago

7 0

1 / 4.5 = x / 39....1 inch to 4.5 ft = x inches to 39 ft
cross multiply
(4.5)(x) = (1)(39)
4.5x = 39
x = 39 / 4.5
x = 8.7 inches <==

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See below

Step-by-step explanation:

Use the formulae directly

For a cone, with base radius = r and height = h, here are the related formula

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Figure(a)

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$\textrm{l} = \sqrt{4^2 + 8^2} =\sqrt{80} = 8.944 \\\textrm{SA} = 4\pi(4 + 8.944) = 4\pi(12.944) = 162.66\\\textrm{V} = (1/3)\pi(4^2)(8) = 134.04$

Figure(b)

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Figure (c)

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<h3 /><h3>Angle on a circumference</h3>

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In other words, the angle at the centre of a circle is twice the angle at the circumference.

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learn more on geometry here; brainly.com/question/16836055

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