You can measure it with a ruler.
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By using Pythagoras' theorem for a right angle triangle.
The best way to find the length of a right triangle is to use the Pythagorean Theorem. The answer would be A = 3.
By using Pythagoras; theorem for a right angle triangle.
Pythagorean Theorem: a2 + b2= c2 where c is the hypotenuse of a right triangle. Hypotenuse is the side of a right triangle opposite to the right angle.
15 units in length