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10x12/2=60cm kw
b = 1,3dm (13cm)
a = 36 - 2*13 = 10
h = 12cm
P = a*h / 2
P = 10*12 / 2
P = 60cm²
Ramie 1,3dm=13cm
Równoramienny równe ramienia
13cmx2=26cm
36cm=obwód
a=podstawa
czyli :
36cm-26cm=10cm
a=10cm
h=12cm
(10cmx12cm):2=60cm2