In a right triangle if one angle is 30° what is the other acute angle?
A
45°
B
50°
C
60°
D
70°
Correct Answer: Option C — 60°
Explanation:
Sum of angles = 180°. With 90° and 30° the third angle = 180°-90°-30° = 60°. The 30-60-90 triangle has side ratios 1:√3:2 and is one of the most important special triangles in mathematics. It appears extensively in trigonometry geometry and physics problems in all levels of competitive examinations.