Answer:
a. 12
Step-by-step explanation:
Congruent in this sense would mean all angles are equal. If that's the case, we could set up this equation to solve for x:
7x + 10 = 94
7x + 10 being triangle ABC and 94 being DEF, they're congruent so I set them equal to each other.
To solve:
7x - 10 = 94 - 10
7x = 84
7x/7 = 84/7
x = 12
