Answer:

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Right Triangles and the Pythagorean Theorem
The Pythagorean Theorem, a2+b2=c2, a 2 + b 2 = c 2 , can be used to find the length of any side of a right triangle.
The side opposite the right angle is called the hypotenuse (side c in the figure).
2/5 = x/10
2/5 x 2 = 4/10
x= 4
2/5 = 4/10
Answer:
4
Step-by-step explanation:
Yeah if you don't know this one... you're... special.