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b=6
(½a)²+h²=b²
(½*4)²+h²=6²
2²+h²=36
h²=36-4=32=16*2
h=4√2
Pb=3*½a*h
Pb=3*½*4*4√2
Pb=24√2
½×h×a=½×2√10×4=4√10