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c niestety nie potrafię ;P
a .) a=10 cm
P= e*f/2
e= 20 cm
f = 20 cm
p = 20 cm *20 cm / 2= 200 cm ²
b.) a=10 cm
P = 6 *( a²√3) / 4
P = 3 * (10²√3) / 2 = 3 * (100 √3)/2= 150 √3 cm ²