In triangle ABC, angle C = 90 degrees, angle A = 30 degrees, AC = 2 ^ 3 find AB.
September 14, 2021 | education
| Given:
ABC – right triangle;
Angle C = 90 °;
Angle A = 30 °;
AC = 2 ^ 3 = 8;
Find AB.
Solution:
In order to find the hypotenuse AB of the triangle ABC, we use the formula:
cos A = AC / AB.
Hence, AB = AC / cos a;
Substitute the known values into the formula and find the hypotenuse AB.
AB = 8 / cos 30 ° = 8 / (√3 / 2) = 8 * 2 / √3 = 16 / √3 = 16 * √3 / (√3 * √3) = 16 * √3 / 3 = 16 / 3 * √3;
Answer: AB = 16/3 * √3.
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