Triangle abc has side lengths: ab = 3.5 cm, bc = 2.4 cm, and ac = 4.2 cm δabc ≅ δhjk what is the length of side hj?

For this you'll want to draw out Triangle ABC and label it as the problem gives you.

Draw a similar triangle to the first one you drew and label it the exact same way as "ABC" and then match the measurement "AB" to "HJ".

Hope this helps.

The answer might be a