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a=12
h-?
P=a^2+2ah
d=2x
x=1/2a-/2
x=6-/2
h^2=l^2-x^2
h^2=10^2 - (6-/2)^2
h^2=100-72
h^2=28
h=2-/7
P=12^2+2*12*2-/7
P=144+48-/7