The length of side AB is 5 units.
What is right triangle?
Right triangle is defined as a triangle which one angle is a right angle or two sides are perpendicular.
The hypotenuse = 13
Let, perpendicular = 12 and base = x
According to Pythagoras theorem,
A right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.
perpendicular²+base²=hypotenuse²
12² + x² = 13²
144 + x² = 169
x² = 169 - 144
x² = 25
x=5
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