In parallelogram ABCD, the cosine of angle A is 0.8. Find the tangent of the angle D.
| December 16, 2020 | education
A and B are adjacent angles, so A + B = 180 degrees.
then
sin (A) = sin (180-B)
i.e. sin A = sin B
then cos B = (1-0.8 ^ 2) ^ (1.2) = 0.6
ANSWER: 0.6
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