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a=5cm
b=6cm
h podstawy:
h=√5²-3²=√16=4cm
pole podstawy=½bh=6×½×4=12cm²
pole boczne=2×5×20+6×20=200+120=320
pole całkowite=2×12+320=344cm²
h postawy=?
h²+3²=5²
h=4
Pp=1/2*6*4=12
Pb=2*20*5+20*6=200+120=320
P=2*12+320=24+320=344
odp:pole wynosi 344