Question

the sides of a triangle are 22cm,20cm and 18cm. Find its area

Answer 1

We find it by herons formula

Let first side=A=22cm

second side=B=20cm

third side =C=18cm

S=(A+B+C)/2

S=(22+20+18)/2

S=60/2=30cm

Area=√[S(S-A)(S-B)(S-C)]

         ⇒√[30(30-22)(30-20)(30-18)]

         ⇒√(30×8×10×12)

         ⇒√28800

         ⇒169.7056 cm²

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Answer 2

this example is solved using heros formula