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BC=30
h-wys ΔCMN
30+h=60√3/2
30+h=30√3
h=30√3-30 cm
a√3/2=30√3-30
a√3=60√3-60 /:√3
a=60-60/√3
a=60-60√3/3
a=60-20√3 cm
P=1/2*(60-20√3)*(30√3-30)
P=1/2(1800√3-1800-600*3+600√3)
P=1/2(2400√3-3600)
P=1200√3-1800
P=600(2√3-3)