Xiangjiao Jiu Shang 4.1 "Sine and Cosine" ppt Draw a right triangle ABC such that ∠A = 50 °, measure the length of the opposite side BC of ∠A is 3cm, and the length of the hypotenuse AB is 3.9cm. The size of the angle and the length of the line segment have measurement errors, so the accuracy is not very high, and it is time-consuming and inefficient.
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