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In a triangle, sin A : sin B : sin C = 3 : 4 : 5. What kind of triangle is it?
AEquilateral
BAcute-angled
CObtuse-angled
DRight-angled
Answer & Solution
Correct answer: D. Right-angled
Sides are proportional to the sines, giving 3:4:5, and 9 + 16 = 25 so one angle is 90 degrees.
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