Odpowiedź:
Szczegółowe wyjaśnienie:
P = a*h/2
Obw = a + b + c
a)
30mm = 3cm
Obw = 3cm + 4cm + 5cm = 12cm
P = 3*4/2 = 6cm^2
b)
Obw = 9cm + 12cm + 15cm = 36cm
P = 9*12/2 = 54cm^2
c)
36mm = 3,6cm
Obw = 3,6cm + 3,9cm + 1,5cm = 9cm
P = 3,6*3,9/2 = 7,02cm^2
d)
Obw = 20cm + 12cm + 16cm = 38cm
P = 20*12/2 = 120cm^2
e)
Obw = 5cm + 12cm + 13cm = 30cm
P = 5*12/2 = 30cm^2
f)
1dm = 10cm
Obw = 10cm + 6cm + 8cm = 20cm
P = 10*6/2 = 30cm^2
