Question

Please help me to solve this

Answer 1

Answer:

perimeter = side +side +side

Let x be the unknown side

62.5 = 18+21+x

62.5 = 39+x

x = 62.5-39 = 23.5

So, the third side = 23.5cm

Answer 2

Answer:

triangle's third side =

23.5 cm

Step-by-step explanation:

given :-

perimeter = 62.5 cm

side 1 = 18 cm

side 2 = 21 cm

to find :-

third side (side 3)

solution :-

side 1 + side 2 + side 3 = triangle perimeter

18 cm + 21 cm + side 3 = 62.5 cm

39 cm + side 3 = 62.5 cm

side 3 = 62.5 cm - 39 cm

side 3 = 23.5 cm

hope it helps.