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You can't tell the dimensions from the area. All you know is that (1/2 x base x height) = 8

and that (hypotenuse)2 = (one leg)2 + (other leg)2 .

There are an infinite number of right triangles that all have area of 8 cm2 .

Here are three of them:

leg --- leg --- hypotenuse

4cm -- 4cm -- 5.657cm

2cm -- 8cm -- 8.246cm

1cm -- 16cm -- 16.031cm

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Q: What are the measurements of a right-angle triangle with an are of 8 cm squared?
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