In a right-angled triangle, the side opposite to angle θ is 6 cm long, and the hypotenuse is 12 cm long. What is the measure of angle θ in degrees?

A) 30°
B) 45°
C) 60°
D) 90°
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✓ A) 30°

sin(θ) = opposite / hypotenuse = 6 / 12 = 0.5 => θ = arcsin(0.5) = 30°