Similarity and Scale Factor

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What is the formula for area of a triangle?

The area $A$ of a triangle can be calculated using $A = \frac{1}{2} \times base \times height$.

If triangle A has sides 3, 4, 5 and triangle B has sides 6, 8, 10, what is the scale factor?

The scale factor is 2.

If two similar shapes have a scale factor of k, how do you find the perimeter of the larger shape?

Multiply the perimeter of the smaller shape by the scale factor k.

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