Answer:
BC = 12 cm
Explanation:
using Pythagoras' identity in the right triangle.
the square on the hypotenuse is equal to the sum of the squares on the other two sides , that is
BC² + AB² = AC²
BC² + 5² = 13²
BC² + 25 = 169 ( subtract 25 from both sides )
BC² = 144 ( take the square root of both sides )
BC =
= 12