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one of the interior angles

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one of the interior angles

by sanju09 » Wed Apr 08, 2009 4:00 am
Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?

(1) Two of the interior angles of ABCD are right angles.

(2) The degree measure of angle ABC is twice the degree measure of angle BCD.


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by sacx » Wed Apr 08, 2009 7:36 am
Stmt I

the measure of angles could be 90,90,90,90 or 90,90,120,60 or 90,90,140,40

Insuff

Stmt II

Angle could be 40,80 or 70,140 etc

Insuff

Stmt I and II

90 + 90 + ABC +BCD = 360

180 + ABC + 2ABC = 360

ABC = 60

BUT ABC could be 45 and BCD = 90

90 + x + 45 + 90 = 360
x = 135

[spoiler]Insuff

E[/spoiler]
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