Practice questions
Answers and explanations
- The correct answer is Choice (B). The sum of all angles in a triangle is 180 degrees, so fill in the values you know using A + B + C = 180 degrees and let x represent the angle you don't know (note that angle A is a right angle, so it's 90 degrees):
- The correct answer is Choice (A). The triangle has two congruent sides (that's what the hash marks represent). That means the two sides are equal. Set their values equal to each other and solve for x: