In triangle abc, the angle c is 90 degrees, the sine of b is 0.4. Find the sine of the outer angle at the vertex B.
| January 10, 2021 | education
The outer corner at the apex of the corner of a triangle is the corner adjacent to it.
The sum of the degree measures of two adjacent angles is 180 °.
Therefore, the degree measure of the angle adjacent to the angle B is
(180 ° – ∠В).
According to the reduction formulas:
sin (180 ° – ∠В) = sin ∠В = 0.4.
Answer: 0.4.
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