Geometry and TrigonometryMediumSide from a sine and the hypotenuse
Geometry and Trigonometry practice question
In right triangle ABC, the right angle is at C and sin A = 5/13. If AB = 26, what is the length of BC?
Answer: 10
sin A = BC/AB, so BC = 26 × 5/13 = 10.
Common wrong answers
- If you answered 5
- 5 copies the numerator without scaling.
- If you answered 13
- 13 halves the hypotenuse.
- If you answered 24
- 24 is AC, the other leg.
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