Triangle ABC – rectangular;
Angle C – 90 degrees;
Angle A – 60 degrees;
Let’s find the equality AC;
The angles of a triangle add up to 180 degrees.
Find corner B.
Angle B = 180 – 60 – 90 = 120 – 90 = 30 degrees.
sin A = AC / AB;
cos A = BC / AB;
AB = AC / sin A;
AB = BC / cos A = BC / (1/2) = 2 * BC.
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