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P=(10+ 6)*5/ :2
P=16 *5/:2
P=8*5
P=40
2²+h²=5²
4+h²=25
h²=25-4
h=√21
P= ½(a+b)h
P=½(6+10)* √21
p=13√21
1/2*(10+6)*5
1/2*16*5
8*5= 40
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