Question

Two sides of a triangle are 7 cm and 8 cm and its semiperimeter is 10 cm. Find the third side of this triangle.​

Answer 1

Step-by-step explanation:

let the first side a=7cm

let the second side b=8cm

let the third side=x

semiperimeter is = 10cm

the third side is = (a+b+x)/2

=> 10= (7+8+x)/2

=> 10=(16+x)/2

=> 10×2=16+x (cross multiplication)

=> 20=16+×

=> 20-16=x

=>x= 4

hence the third side is 4cm

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