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a=8cm
b=?
h=?
x-->czesc dluzszej podstawy
z wlasnosci kata ostrego 45°wynika zaleznosc
h=x
z pitagorasa
8²+h²=10²
h²=100-64
h=√36=6 cm --->wysoksoc trapezu
to b=a+x=8+6=14cm --->dluzsza podstawa
pole trapezu
p=1/2(a+b)·h=1/2·(8+14)·6=1/2·22·6=66cm²