Odpowiedź:
P=(21+15)*4/2=36*4/2=144/2= 72cm2
(a+b) ×h÷2
(15cm+21cm) ×4cm ÷2
36×4÷2=144÷2=72cm
Odp=72cm
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Odpowiedź:
P=(21+15)*4/2=36*4/2=144/2= 72cm2
Odpowiedź:
(a+b) ×h÷2
(15cm+21cm) ×4cm ÷2
36×4÷2=144÷2=72cm
Odp=72cm