Odpowiedź:
zad 1
a - jeden bok
a + 25 cm - drugi bok
o - obwód = 19,4 dm = 194 cm
o = 2a + 2(a + 25 cm) = 2a + 2a + 50 cm = 4a + 50 cm
4a + 50 cm = 194 cm
4a = 194 cm - 50 cm = 144cm
a = 144 cm : 4 = 36 cm - jeden bok
a + 25 cm = 36 cm + 25 cm = 61 cm - drugi bok
P - pole = a * (a + 25 cm) = 36cm * 61 cm = 2196 cm² = 21,96 dm²
zad 2
o - obwód = 88 cm
P - pole = 88 cm²
a - bok rombu = o : 4 = 88 cm : 4 = 22 cm
P = a * h
h - wysokość rombu = P : a = 88 cm² : 22 cm = 4 cm
