Slide to scale

Match the blue shape to the dashed outline to find the scale factor ().

Base (1x)
Scale Factor check_circle
0.51.01.52.02.53.03.54.0

Tap correct length

These rectangles are similar. The scale factor is . Find the missing side.

Shape A

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?

Shape B

Drag to build

Perimeters scale by . Drag the perimeters to complete the ratio.

Triangle A

Sides:

Perimeter =

Triangle B (k=)

Sides:

Perimeter =
Ratio =
=
verified Correct!

Tap to pack

If side length scales by , how does area scale? Fill the large square.

1
1
Area scales by
Squares placed: {{ s4FilledCount }} / {{ s4K * s4K }}
🎉

Similarity Master!

You discovered that when sides scale by k:
Perimeters scale by k
Areas scale by k²