Question

Draw the images P’, Q’ and R’ of the points P, Q and R respectively in the line n. Join P’Q’ and Q’ R’ to form an angle P’Q’R’. Measure ∠PQR and ∠P’Q’R’. Are the two angles equal?

Answer 1

The images of the points P, Q and R in the line n are P’, Q’ and R’, respectively.

It is clear that, ∠PQR = ∠P’Q’R’