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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 ABC is twice the degree measure of angle BCD
Going with C. Sum of angles in quad. = 360 degrees
1) The other two angles could both be 90 degrees, or they could be 60 and 120. Insufficient.
2) Is ABC 40 and BCD 20? or maybe ABC is 60 and BCD is 30? INSUFF.
Together it tells you that 90 + 90 + x + 2x = 360. x = 60