Question

2、已知:如图,圆锥的母线长AB=6cm,底面半径OB=2cm,求(1)圆锥的高AO;(2)锥角∠CAB;

Answer 1

1.根据勾股定理,AO=√（6^2-2^2)=4√2cm=5.657cm

2.由sin∠OAB=2÷6=1/3,可得∠OAB=arcsin1/3=19.47度.而∠OAB=∠OAC,所以∠CAB=2∠OAB=38.94度.