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Scale Factors question!?

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Can anyone tell me how to do this.

The answers I have are multiple choice of

540in

270 in

216 in

and 43.2 in

The scale factor of two similar triangles is 5:2. The perimeter of the smaller triangle is 108inches. What is the perimeter of the larger triangle?

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  1. The perimeter is the sum of the sides.

    Each side will be increased by a scale factor of 5:2, so the perimeter will be as well.

    Hence perimeter is 5*108/2 inches = 270 inches.

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