Question

Oblicz pole koła o promieniu równym :
a) 2 cm
b) 10 dm
c) 5m
d) 40 cm
e) 0,1 dm
f) 1/5 m

Answer 1

A) r=2 cm
P = pi * r^2 P= pi * 4cm^2

b) r=10 dm
P = pi * r^2 P= pi * 100cm^2

c) r=5m
P = pi * r^2 P= pi * 25m^2

d) r=40 cm
P = pi * r^2 P= pi * 1600cm^2

e) r=0,1 dm = 10cm
P = pi * r^2 P= pi * 100cm^2

f) r=1/5 m
P = pi * r^2 P= pi * 1/25m^2

Answer 2

A)II4 cm
b)II100 dm
c)II25m
d)II1600cm
e)II0,01dm
f)II0,4 m

II-to jest pi

Answer 3

P= π × r²
a)p= π × 2²= 4π
b)p=100π
c)p=25π
d)p=1600π
e)p=0.01 π
f)p= 1/25 π