Объяснение:
BK -висота
sin 60 = BK/AB
✓3/2=BK/10
BK=5√3
S=AB+BC/2 * BK = 40*5√3 = 200√3
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Объяснение:
BK -висота
sin 60 = BK/AB
✓3/2=BK/10
BK=5√3
S=AB+BC/2 * BK = 40*5√3 = 200√3