The hypotenuse of a right-angled triangle is 16 units and one of the sides of the triangle is 8 units. Find the measure of the third side using the Pythagoras theorem formula.          

Hypotenuse = 16 units
Let us consider the given side of a triangle as the perpendicular height = 8 units
On substituting the given dimensions to the Pythagoras theorem formula

$Hypotenus{e}^2 =Bas{e}^2 +Heigh{t}^2$

${16}^2=B^2+8^2$

$B^2=256-64$

$B=\sqrt{192}$

$B=13.856$units.

Therefore, the measure of the third side of a triangle is 13.856 units.