Odpowiedź:
1. A) 1km = 1000m
20m
P = ab = 1000m * 20m = 20000m^2
B) 5cm = 50mm
7mm
P = ab = 50mm * 7mm = 350mm^2
2. A) W cm^2:
P = ab = 525cm * 723cm = 379 575cm^2
B) W m^2:
a = 525cm = 5,25m
b = 723cm = 7,23m
P = ab = 5,25m * 7,23m = 37,9575m^2
3. A) L = 48cm
L = 4a
a = L:4
a = 48cm : 4 = 12cm
P = a^2= (12cm)^2= 144cm^2
B) P= 36cm^2
P = a^2
a = 6cm
L = 4a = 4 * 6cm = 24cm
4. A) P1 = ab = 7cm * 15cm = 105cm^2
P2 = ab = 2cm * 3cm = 6cm^2
Pc = P1 + P2 = 105cm^2 + 6cm^2 = 111cm^2
B) 5cm + 3cm + 3cm = 11cm
Pc = 11cm * 5cm = 55cm^2
P1 = ab = 3cm * 5cm = 15cm^2
55cm^2 - 15cm^2 = 40cm^2
