It is known that in a right-angled triangle ABC with a right angle A, the hypotenuse BC = 21, cosC = 0.2. Determine the leg length AC.
| December 18, 2020 | education
The cosine of an acute angle of a right-angled triangle is equal to the ratio of the adjacent leg to the hypotenuse: AC / BC
AC / 21 = 0.2, AC = 0.2 * 21 = 4.2
Answer: 4.2
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