АМ=4sqrt(15)*sqrt(3)/2=2sqrt(45)=6sqrt(5)
SA=a*tg60 ° =4sqrt(15)*sqrt(3)=4sqrt(45)=12sqrt(5)
Апофема большей боковой грани
SM^2=PA^2+AM^2=(12sqrt(5))^2+(6sqrt(5))^2=144*5+36*5=(144+36)*5=180*5=900
SM=30
S=(1/2)a*SM=(1/2)*4sqrt(15)*30=60sqrt(5)