Question

5. Triangle ADE is enlarged to form triangle ABC 6 cm 10 cm 5 cm 6 cm 7 cm 7 cm. What is the scale factor?

Answer 1

Notice that the length AB is 12cm, the length AC is 14cm and BC equals 10cm.

By comparing those sides with AD=6cm, AE=7cm and DE=5cm respectively, we can see that:

`\begin{gathered} AB=2AD \\ AC=2AE \\ BC=2DE \end{gathered}`

Therefore, the scale factor is 2.