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=1/2.(9+12).t
=1/2.21.t
=10,5t
K=s1+s2+s3+s4
50=9+12+10,5t+10,5T
50-9-12=10,5t+10,5t
29=21t
29÷21=t
1,38=t
L=1/2.(s1+s2).t
=1/2.(9+12).1,38
=1/2.21.1,38
=10,5.1,38
=14,49 cm2