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x/7=6/3+7
x/7=6/10
10x=42 /:10
x=4,2
3²-a²=h²
9-(1,8)²=h²
9-3,24=h²
5,76=h²
h=2,4
P=12 (x+6) * h
P=1/2 (4,2+6)*2,4
P=12 *10,2 * 2,4
P=12,24