# 7. In a right triangle $\inline ABC,$ $\inline \angle B=90^{\circ}$(a)  If $AB=6cm$, $BC=8cm$, find $AC$

$AC^2 = AB^2 + BC^2 = 6^2 + 8^2 = 100$
By prime factorisation of 100 :-   $2\times2\times5\times5$