1.

What is the formula for the internal tapered angle of blind hole?

A. Sin A/2 = (l<sub>1</sub>-l<sub>2</sub>)/2h
B. Cot A/2 = (l<sub>1</sub>-l<sub>2</sub>)/2h
C. Cos A/2 = (l<sub>1</sub>-l<sub>2</sub>)/2h
D. Tan A/2 = (l<sub>1</sub>-l<sub>2</sub>)/2h
Answer» E.


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