podstawa:
12 dm---100%
x dm---75%
x=9 dm
P=(a+b)*h/2
P=(19 dm+9 dm)*12 dm/2
P=168 dm2
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podstawa:
12 dm---100%
x dm---75%
x=9 dm
P=(a+b)*h/2
P=(19 dm+9 dm)*12 dm/2
P=168 dm2