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AD=5cm P=½×(15+9)×4
|AD|=|CB| P=½×24×4
a=15cm P=12×4
b=9cm P=48cm²
h= 15-9=6 6÷2=3
z pitagorasa h²+3²=5²
h²+9=25
h²=25-9
h²=16
h=√16
h=4