Circle theorems I — practice question

Complete the statements below by using three different triangles. Triangle $DEF$ is congruent to triangle [BLANK]. Triangle [BLANK] is congruent to triangle [BLANK].

Finish the statements and reasons. In triangles $OPT$ and $OQT$: $OP = [BLANK]$ because each one is a radius of the circle. $OT$ is the side shared by both triangles. Angle $OPT =$ angle $[BLANK] = 90^{\circ}$ because [BLANK]. Triangles $OPT$ and $OQT$ are congruent by the criterion [BLANK]. This shows that the tangents $TP$ and $TQ$ are [BLANK].