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The figure below shows a parallelogram ABCD with perpendicular diagonals AC and BD.
If it is given that angle DAB is 80°, which statement is sufficient to guarantee that the parallelogram is a rhombus with all sides equal?
 one year ago
 one year ago
The figure below shows a parallelogram ABCD with perpendicular diagonals AC and BD. If it is given that angle DAB is 80°, which statement is sufficient to guarantee that the parallelogram is a rhombus with all sides equal?
 one year ago
 one year ago

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AnswerthisnowBest ResponseYou've already chosen the best response.0
Angle CAB is 40°, and angle DBA is 50°. Angle CAB is 50°, and angle DBA is 60°. Angle DBA is 40°. Angle CAB is 60°.
 one year ago

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@AccessDenied here it is ^^
 one year ago

AnswerthisnowBest ResponseYou've already chosen the best response.0
now when they say DAB is 80 degrees do they mean angle A or what?
 one year ago

AccessDeniedBest ResponseYou've already chosen the best response.3
dw:1338659650776:dw That entire angle.
 one year ago

AccessDeniedBest ResponseYou've already chosen the best response.3
I am thinking this deals with the idea that the diagonals should bisect their respective angles... so I believe we can assume this is true for it to be a rhombus: dw:1338659975193:dw
 one year ago

AccessDeniedBest ResponseYou've already chosen the best response.3
So, if we are bisecting an angle of 80 degrees, then we know that the bisected angle is 1/2 of 80, or 40: dw:1338660097272:dw
 one year ago

AccessDeniedBest ResponseYou've already chosen the best response.3
So, you can also conclude that the other angle using the sum of interior angles of a triangle. 40 + x + 90 = 180, x = 50 Now, which answer 'fits' for our diagram now? dw:1338660264049:dw
 one year ago

AccessDeniedBest ResponseYou've already chosen the best response.3
Yep! Basically, we just assume that it is a rhombus, and that the properties of a rhombus apply. The ideal answer should just pop out as we fill in the information. :D
 one year ago

AnswerthisnowBest ResponseYou've already chosen the best response.0
Thank you very much. Four more to go. You up to it? :)
 one year ago
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