Question

The semi-perimeter, s, of a triangle having sides 5 cm, 8 cm and 12 cm is

• A. 25 cm
• B. 50 cm
• C. 12.5 cm
• D. 15 cm

Answer 1

The correct option is C 12.5 cm

The semi-perimeter (s) of a triangle with sides a, b and c is given by:
$s=\frac{a+b+c}{2}$
$\text{So,}s=\frac{5+8+12}{2}$
$⟹s=12.5\text{cm}$