Question

find the area of a triangle two sides are 18cm and 10 cm and the perimater ia 42 cm?

Answer 1

perimeter=42
18+10+x=42
x=42-28=14

you can find area through heron's formula

Answer 2

first you had to find third side by 42-(18+20)=14 here is your third side and you can solve it as shown in photograp hope it helps you