ACD is a straight angle. Which of the following is a true statement about the figure?
http://up.mezimages.com/up/01/1406842triangle.jpg (triangle i drew up)
(the 60s represent degrees)
1) ABC is a right triangle
2) Angle 2 is 120 degrees
3) Angle 3 is 30 degrees
4) Angle 4 is 60 degrees
5) BCD is an isoceles triangle
The answer given to me is 2 (Angle 2 is 120 degrees). I don't understand how this is true. ACD is a straight angle, right? So that means A+C+D must add up to 180 degrees, right? How can angle 2 equal to 120 degrees, if angle A is equal to 60 degrees? Those two angles add up to 180 degrees, leaving angle D without a number.
2007-01-22
13:41:30
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4 answers
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asked by
Anonymous
in
Mathematics