In triangle ABC, angle C is 90 degrees BC = 8√6 sinB = 0.2 find the length of the sides AB.
June 22, 2021 | education
| Triangle ABC is rectangular with 90 ° right angle.
Since BC = 8 * √6 and sin b = 0.2, then we find the side AB.
To calculate the hypotenuse AB of the ABC triangle, we use the formula:
cos b = BC / AB;
We multiply the values cross by cross and then we get:
BC = AB * cos b;
AB = BC / cos b;
AB = BC / √ (1 – sin ^ 2 b);
Substitute the known values into the formula and calculate the leg of the triangle ABC.
AB = 8 * √6 / √ (1 – 0.2 ^ 2) = 8 * √6 / (1 – 0.04) = 8 * √6 / √0.96 = √ (6 / 0.96) * 8 = √ (1 / 0.16) * 8 = 8 / √0.16 = 8 / 0.4 = 80/4 = 20;
Answer: AB = 20.
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