Instructions.
In this interactive, triangle \(ABC\) is the original triangle. You may click and drag vertices \(A\text{,}\) \(B\text{,}\) and \(C\) to change its shape, expand it, or shrink it.
Triangle \(PQR\) is constructed to be similar to triangle \(ABC\text{.}\) Use the slider at the top to change the scale factor \(k\text{,}\) which enlarges or reduces triangle \(PQR\text{.}\)
The angle measures of both triangles are displayed. As you manipulate the triangles, observe carefully:
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What happens to the side lengths?
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What happens to the angle measures?
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Which properties stay the same even when the size changes?