Question 1043887
1) False
The sum of any two sides of a triangle must be greater than the third
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2) False
see 1) explanation and note that 5+6 < 12
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3) False
hypotenuse of a right triangle is the longest side
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4)
diagonals bisect each other, therefore OB = 8 and BD = 16
a = 6, b = 12
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we have the following relationship between the diagonals and the sides of a parallelogram 
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BD^2 + AC^2 = 2(6^2 + 12^2)
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256 + AC^2 = 2(180) = 360
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AC^2 = 104
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AC = 10.20
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False
16(BD) is not greater than 10.20(AC)
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