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YangchenZangmo ∙
I can't really tell what that is. The perimeter of a triangle is the distance around it; the sum of its sides.
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it is really easy
17
8:9 or 8 to 9
18/8 * 9/16 = 18*9/(8*16) = 9*9/(8*8) = 81/64 or 1.265625
0.8889