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Q: What is the length ef in the right triangle below?

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120

Since there is no triangle "below", all that can be said is that EF - if it is the third side of the triangle - is any length in the interval (24, 54).

The answer depends on the labels of the sides which are 19 and 12.

Use Pythagoras' theorem to find the 3rd side

20x

15 units

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20x

8x

8x

11

I assume the corresponding sides are AB and EF, and EF is a side of the larger (second) triangle. scale factor 3 means each length of the second is 3 times as long as the first. ⇒ if AB = 6 units, EF = 3 x 6 units = 18 units.

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