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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:
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.