boki prostokata : a i b
obwod O=4m
P=?
2a+2b=4 /:2
¼(a-b)+½·4=2
{a+b=2
{¼a-¼b+2=2
{a=2-b
{¼(2-b) -¼b=2-2
{½-¼b-¼b=0
{-½b=-½
{b=1
{a=2-1=1m
{b=1m
pole prostokata:
P=ab=1m·1m=1m²
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boki prostokata : a i b
obwod O=4m
P=?
2a+2b=4 /:2
¼(a-b)+½·4=2
{a+b=2
{¼a-¼b+2=2
{a=2-b
{¼(2-b) -¼b=2-2
{a=2-b
{½-¼b-¼b=0
{a=2-b
{-½b=-½
{a=2-b
{b=1
{a=2-1=1m
{b=1m
pole prostokata:
P=ab=1m·1m=1m²