Zadanie 2. a) 4,2 ha = 42 000 m² b) 600 a = 6 ha c) 30 000 m² = 3 ha d) 500 m² = 5 a e) 70 ha = 7 000 a f) 200 a = 20 000 m²
Zadanie 3. równoległobok: a = 2 cm h = 2 cm P = 2 * 2 = 4 cm² trójkąt: a = 1,5 cm h = 2 cm P = 1,5 * 2 : 2 = 1,5 cm² trapez: a = 5 cm b = 2 cm h = 2 cm P = (5 + 2) * 2 : 2 = 7 cm²
Zadanie 4. trójkąt ACE: a = 12 cm h = 8 cm P = 12 * 8 : 2 = 48 cm² równoległobok ABDE: a = 12 : 2 = 6 cm h = 8 cm P = 6 * 8 = 48 cm² trapez ACDE: a = 12 cm b = 12 : 2 = 6 cm h = 8 cm P = (12 + 6) * 8 : 2 = 18 * 4 = 72 cm² romb BHEG: d1 = 12 : 2 = 6 cm d2 = 8 cm P = 6 * 8 : 2 = 48 : 2 = 24 cm²
Zadanie 2.
a) 4,2 ha = 42 000 m²
b) 600 a = 6 ha
c) 30 000 m² = 3 ha
d) 500 m² = 5 a
e) 70 ha = 7 000 a
f) 200 a = 20 000 m²
Zadanie 3.
równoległobok:
a = 2 cm
h = 2 cm
P = 2 * 2 = 4 cm²
trójkąt:
a = 1,5 cm
h = 2 cm
P = 1,5 * 2 : 2 = 1,5 cm²
trapez:
a = 5 cm
b = 2 cm
h = 2 cm
P = (5 + 2) * 2 : 2 = 7 cm²
Zadanie 4.
trójkąt ACE:
a = 12 cm
h = 8 cm
P = 12 * 8 : 2 = 48 cm²
równoległobok ABDE:
a = 12 : 2 = 6 cm
h = 8 cm
P = 6 * 8 = 48 cm²
trapez ACDE:
a = 12 cm
b = 12 : 2 = 6 cm
h = 8 cm
P = (12 + 6) * 8 : 2 = 18 * 4 = 72 cm²
romb BHEG:
d1 = 12 : 2 = 6 cm
d2 = 8 cm
P = 6 * 8 : 2 = 48 : 2 = 24 cm²