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10. P(trojkata) = 1/2 ah = 1/2 * 6 * (x+3)=3x+6
3x+6=18
3x=12
x=4
11. 2(a+a+1+2a+1)+2(4a+1)= 2a+2a+2+4a+2+8a+2=16a+6
16a+6=14
16a=8
a=1/2
12. P(trapezu)=(a+b)*h/2=1/2(x+3x+2+x+1)*2=2x+6x+4+2x+2=10x+6
10x+6=36
10x=30
x=3
13. B