A rectangle ABCD has AB=12cm and BC=6cm then the length of its diagonal is
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AC^2 = AB^2 + BC^2 (PYTHAGORAS THEOREM)
AC^2 = 12^2 + 6^2
AC^2= 144 + 36
AC^2 = 180
AC= √180
AC = √2×2×3×3×5
AC = 2×3√5
AC = 6√5
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