Question

知斜三棱柱ABC—A1B1C1中,∠BAC=90°,AB=AC=a,∠AA1B1=∠AA1C1=60°,∠BB1C1=9

Answer 1

由题知：A1B1=A1C1=a,AA1=BB1=CC1,BC=B1C1=gen2*a

侧面积=S(AA1C1C)+S(AA1B1B)+S(BB1C1C)=2a*b*cos60°+gen2*a

*b=a*b*(1+gen2)