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A
3/2 = x/3
x=4,5
P(trapezu)=(3+4,5)*5/2-7,5*2,5 = 18,75
P₁=4,5 * 3 / 2 = 6,75
P₂=3*2/2= 3
P₃=P(trapezu)-P₁-P₂
P₃=18,75-6,75-3= 9
B
c²=a²+b²
c²=3²+4²
c²=9+16
c²=25
c=5
z=5-3 = 2
2/4 = x/3
x = 1,5
1/3 = y/4
y = 4/3
P₁=2*1,5/2 = 1,5
P₂=1*(4/3)/2 = 2/3
P(trójkata)=3*4/2 = 6
P₃=6- 1,5 = 4(3/6) - (2/6) = 4(1/3)
C
ostatni rysunek nie jest mozliwy!