Question

What is the length of the unknown leg of the right​ triangle?
8 ft
3 ft
​(The figure is not drawn to​ scale.)
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Part 1
The length of the unknown leg of the right triangle is
  
enter your response here ft.
​(Round to one decimal place as​ needed.)

Answer 1

Assuming 8 ft is the hypotenuse and 3 ft is one leg, use the Pythagorean theorem:

b = sqrt(8^2 − 3^2) = sqrt(64 − 9) = sqrt(55) ≈ 7.4 ft.

So the unknown leg is 7.4 ft.