You might want to use a ruler, a protractor, and a pair of scissors.
See solution
Practice makes perfect
Our conclusion from Exploration 1(d) tells us that when two pairs of corresponding sides and the corresponding included angles of two triangles are equal, they are congruent triangles. To prove this, you can use a ruler and protractor to construct some triangles where two sides and the included angle are congruent.
After that, you should cut them out and place them on top of each other. If they completely cover each other, they are congruent triangles.
You can do this as many times as you want until you have removed all doubt from your brain that the triangles are congruent.
