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b=x+3
Ob=22cm
Ob= x+x+x+3+x+3=4x+6
22cm=4x+6cm
4x=16cm /:4
x= 4cm
a=4cm
b=7cm
h=?
4cm=h
h=
h=2
Pr= a*h
Pr= 7cm*2
Pr= 14