Triangle ABC angle C is 90 degrees BC is 6 √6 AC is 3, find cos A.
| April 2, 2021 | education
In a right-angled triangle ABC, according to the Pythagorean theorem, we determine the length of the hypotenuse AB.
AB ^ 2 = AC ^ 2 + BC ^ 2 = 9 + 216 = 225.
AB = 15 cm.
The cosine of an acute angle of a right-angled triangle is the ratio of the adjacent leg to the hypotenuse: CosBAC = AC / AB = 3/15 = 1/5.
Answer: The cosine of angle A is 1/5.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.
