Bulaj ma średnice 40cm.Ile bulajów wpuszcza tyle światła co okno o wymiarach 125 cm x 90cm ?
r=20
P=πr²
P=3,14*400
P=1256
P=125*90=11250
11250/1256≈9
Bulaj:
d = 40cm
r =d/2 =20cm
P1 =pi *r^2
P1 =3,14 *(20cm)^2 =3,14 *400 =1 256 cm2
Okno:
P2 =125cm*90cm =11 250 cm2
Ilość bulajów :
n =P2/P1
n =1250cm2/1256cm2 = ok.9
n = 9
========
Odp.Potrzeba 9 bulajów.
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r=20
P=πr²
P=3,14*400
P=1256
P=125*90=11250
11250/1256≈9
Bulaj:
d = 40cm
r =d/2 =20cm
P1 =pi *r^2
P1 =3,14 *(20cm)^2 =3,14 *400 =1 256 cm2
Okno:
P2 =125cm*90cm =11 250 cm2
Ilość bulajów :
n =P2/P1
n =1250cm2/1256cm2 = ok.9
n = 9
========
Odp.Potrzeba 9 bulajów.