U would divide 4 and 5. Since 4 is smaller than 5, you would put a decimal after 4 and put a 0 after the decimal. So it should look like this 4.0 divided by 5 and put the decimal up to the quotient and just divide normal and u should get 0.8
This is the concept of transformations, given that ABC was rotated it implies that it retained it's original dimensions. This means that ABC is proportional to EFD. Therefore, given that EF=4.2 cm, DF=3.6 cm and DE=4.5 cm. The CB=FD=3.6 cm
