Question

The semi perimeter of a triangle is 10cms.if one of its sides is 5cms and 7cms respectively then its third side as_______

Answer 1

Answer:

8cm is the 3rd side

Step-by-step explanation:

semi perimeter = (a + b+ c) /2

let the 3rd side be x

10 = (5+7+x)/2

10*2 = 12 + x

20 = 12 + x

20-12 = x

8 = x

8 cm = x

hope it helps :)