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P=1/2*4*8=16cm
P=1/2*8*h
16cm:4=4cm
h=4cm
4²+8²=a2²
a2²=16+64
a2²=40
a2=4√5
Ptr=1/2*a*h
Ptr=1/2*a1*h1
Ptr=1/2*a2*h2
1/2*a1*h1=1/2*a2*h2
h2=(1/2*a1*h1)/(1/2*a2*)
h2=(1/2*8*4)/1/2*4√5
h2=16/2√5
h2=16 √5 /10
h2=8√5/5