Which of the following statements is true about the angle formed by two perpendicular lines in a right triangle?

• A. They form an angle of $90°$.
• B. They form an angle of $60°$.
• C. They form an angle of $45°$.
• D. They form an angle of $30°$.

Answer: (A)

Verified step by step guidance

1. Recall the definition of perpendicular lines: two lines are perpendicular if they intersect to form a right angle.
2. A right angle is an angle that measures exactly \$90^\circ$.
3. In a right triangle, the two legs meet at the right angle, which means the angle formed by these two perpendicular sides is \$90^\circ$.
4. The other angle measures given (\$60^\circ\(, \)45^\circ\(, \)30^\circ$) are common angles in special triangles but do not represent the angle formed by perpendicular lines.
5. Therefore, the true statement is that the angle formed by two perpendicular lines in a right triangle is \$90^\circ$.