zad.25
Pole rombu to e*f/2
1. 19*13/2=123,5 dm²
2. 42*25/2=525 cm²
3. 8*4/2 = 16dm²
zad.26
a) 8cm
P= e*f/2 = 8 * 8/2 = 64 / 2 = 32cm²
b) 10dm
P= e*f/2 = 10 * 10/2 = 50dm²
c) 24m
P=e*f/2 = 24* 24/2 = 576 / 2= 288m²
d) 5cm
P=e*f/2 = 5 * 5 / 2 = 25 / 2 = 12,5cm²