(1)直角边a=b*tan60°=10√3,B=90°-60°=30°,c=b/cos60°=10/(1/2)=20;
(2)c=√(2√5)^2+(2√15)^2)=√(80)=4√5,A=arctan(a/b)=arctan[(2√5)/(2√15)]=arctan(√3/3)=30°;
B=90¤-60°=30°;
(1)直角边a=b*tan60°=10√3,B=90°-60°=30°,c=b/cos60°=10/(1/2)=20;
(2)c=√(2√5)^2+(2√15)^2)=√(80)=4√5,A=arctan(a/b)=arctan[(2√5)/(2√15)]=arctan(√3/3)=30°;
B=90¤-60°=30°;