Question

the answer is 1:20 but i need a detailed explanation please
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Answer 1

Given the length of sides of triangle ABC are 5,6,7 cm

then it's perimeter is 5+6+7= 18 cm

and Given the perimeter of triangle DEF is 360 cm

the ratio of perimeters of triangle ABC and DEF is

18/360 =1/20

1:20 ratio

so option c is correct

hope it helps you ☺️