Odpowiedzi

2010-03-18T15:20:03+01:00
P = 1/2 a × h

5 dm = 50 cm = 0,5 m
7 dm = 70 cm = 0,7 m

Pole w centymetrach:
P = 1/2 × 50 cm × 70 cm
P = 1750 cm²

Pole w metrach:
P = 1/2 × 0,5 m × 0,7 m
P = 0,175 m²
2010-03-18T15:21:00+01:00
A = 5 dm
h = 7 dm
P = a * h / 2
P = 5 dm * 7 dm / 2 = 35 dm(2) / 2 = 17, 5 dm(2)
1 dm(2) = 100 cm(2)
1 dm(2) = 0,01 m(2)
P = 1750 cm(2) = 0,175 m(2)
2010-03-18T15:25:24+01:00
Pole trójkąta = 1/2 *a*h
5 dm = 50cm
7dm = 70cm
5dm= 0,5m
7dm= 0,7m

Pt= 1/2 * 50cm * 70cm = 25cm * 70cm = 1750cm(2)
pt= 1/2 * 0.5m * 0.7m = 0.25m * 0.7m = 0.175m(2)