H²=13²-5²=169-25=144
h=√144=12 cm
S=0.5×10×12=5×12=60 cm²
1)Смежные углы в сумме дают 180 градусов т.е смежный угол с углом АВС=180-30
АВС=150
2) вертикальные углы равно т.е вертикальный угол с углом АВС=30
Пусть высота a в прямоугольнике равна 5
А диагональ с = 13
Тогда по теореме пифагора: a^2+b^2=c^2
b^2=13^2-5^2=169-25=144
b=12
S=a*b=5*12=60
Had remembered, would have sent
Hadn't been ill, would have gone
Wouldn't have broken, had been
Would have got, hadn't taken
Had done, Wouldn't have shouted
Would have passed, had studied
Had closed, Wouldn't have run away
Would have lost, hadn't picked
Had saved, he would have been able