Pole trapezu jest równe: _________
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Odpowiedź:
p= (a+b) ×h/2
p= (a+4+2a+8) ×(a+2)/2=
(12+3a) ×(a+2)/2 wymnazamy nawiasy
(12a+3a²+24+6a) /2=
(18a+24+3a²)/2=
9a+12+(3a²/2)