HL congruence means the hypotenuse and one leg of the triangle are congruent. By looking at theses triangles we can count the boxes on the graph and see that both hypotenuses and both of the legs are congruent. So HL congruence can be used to justify this.
Step-by-step explanation: How I did it was use the website demos scientific calculator and put the question of what is 60% of 30 and it gave the answer!
