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jasenka [17]
3 years ago
6

Find n and r 10 pointsss

Mathematics
1 answer:
Leya [2.2K]3 years ago
3 0

Answer/Step-by-step explanation:

The two triangles we have in the diagram shar the same vertex. They are both similar triangles. Therefore, their side lengths would be proportional.

This means:

\frac{9.8}{4.3} = \frac{r}{5.1} = \frac{n}{2.7}

Solve for variable r and n respectively.

Thus:

\frac{9.8}{4.3} = \frac{r}{5.1}

Multiply both besides by 5.1

\frac{9.8}{4.3} \times 5.1 = \frac{r}{5.1} \times 5.1

\frac{9.8 \times 5.1}{4.3} = r

11.6 = r (nearest tenth)

Also,

\frac{9.8}{4.3} = \frac{n}{2.7}

Multiply both besides by 2.7

\frac{9.8}{4.3} \times 2.7 = \frac{n}{5.1} \times 2.7

\frac{9.8 \times 2.7}{4.3} = r

6.2 = n (nearest tenth)

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Answer: 33 ft².


Step-by-step explanation:

1. As you can see in the figure attached, the trapezoid is formed by a rectangle and two equal right triangles. The base of each triangle is 4 feet and you know the lenght of the hypotenuse AD, therefore, you can calculate the height by applying the Pythagorean Theorem:

h=\sqrt{(5ft)^{2}-(4ft)^{2}}=3ft

2. Now, you can calculate the area with the following formula:

A=(\frac{B+b}{2})h

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