Question

HELP PLEASE!!!!

Triangle ABC is similar to triangle DEF? The length of line BC is 21 cm. The length of line DE is 10 cm. The length of line EF is 14 cm.
What is the length of line AB?

Answer 1

wouldnt it be 10 since its similar to def?

Answer 2

Triangle ABC is similar to triangle DEF

AB/BC = DE/EF
x/21 = 10/14
14x = 21*10
14x = 210
x = 210/14
x = 15

answer: length of line AB = 15cm