Given a right triangle where one of the acute angles is $30°$, what is the measure of the other acute angle?

• A. $90°$
• B. $45°$
• C. $60°$
• D. $30°$

Answer: (C)

Verified step by step guidance

1. Recall that the sum of the interior angles in any triangle is always \$180^\circ$.
2. In a right triangle, one angle is always \$90^\circ$ by definition.
3. Given one of the acute angles is \$30^\circ\(, add the right angle and this acute angle: \)90^\circ + 30^\circ = 120^\circ$.
4. Subtract this sum from \$180^\circ\( to find the measure of the other acute angle: \)180^\circ - 120^\circ$.
5. The result is the measure of the other acute angle, which completes the triangle.