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The area of a kite is 920 square meters. If one diagonal is three times the length of the other diagonal, what are the lengths of the diagonals? Round to the nearest tenth.Multiple choice question.A)23.3 in., 70.0 in.B)20.1 in., 60.3 in.C)31.2 in., 91.6 in.D)24.8 in., 74.3 in.

Question

The area of a kite is 920 square meters. If one diagonal is three times the length of the other diagonal, what are the lengths of the diagonals? Round to the nearest tenth.Multiple choice question.A)23.3 in., 70.0 in.B)20.1 in., 60.3 in.C)31.2 in., 91.6 in.D)24.8 in., 74.3 in.

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Solution

To solve this problem, we need to use the formula for the area of a kite, which is given by:

Area=12×d1×d2 \text{Area} = \frac{1}{2} \times d_1 \times d_2

where d1 d_1 and d2 d_2 are the lengths of the diagonals. We are given that the area of the kite is 920 square meters and that one diagonal is three times the length of the other diagonal. Let's denote the shorter diagonal as d1 d_1 and the longer diagonal as d2 d_2 . According to the problem, d2=3d1 d_2 = 3d_1 .

Substitute d2 d_2 in the area formula:

920=12×d1×3d1 920 = \frac{1}{2} \times d_1 \times 3d_1

Simplify the equation:

920=12×3d12 920 = \frac{1}{2} \times 3d_1^2

920=32d12 920 = \frac{3}{2} d_1^2

Multiply both sides by 2 to clear the fraction:

1840=3d12 1840 = 3d_1^2

Divide both sides by 3:

d12=18403 d_1^2 = \frac{1840}{3}

d12=613.33 d_1^2 = 613.33

Take the square root of both sides to find d1 d_1 :

d1=613.33 d_1 = \sqrt{613.33}

d124.8 d_1 \approx 24.8

Since d2=3d1 d_2 = 3d_1 :

d2=3×24.8 d_2 = 3 \times 24.8

d274.4 d_2 \approx 74.4

So, the lengths of the diagonals are approximately 24.8 meters and 74.4 meters. The closest match to these values in the given options is:

D) 24.8 in., 74.3 in.

This problem has been solved

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