# Thread: How do you work out 3 missing angles in a quadrilateral?

1. ## How do you work out 3 missing angles in a quadrilateral? var addthis_config = {"data_track_clickback":false};

None of the angles are parallel, opposite or right angles. And the only angle i have is 120 degrees. Please help me.

2. It would be easiest if a diagram was available.

You would probably need to break your quadrilateral up into right triangles, and work from there. Start with a right triangle that incorporates your 120° angle. Find the missing sides and angles of the triangle. Work from there.

3. you cant completely figure them out unless you have a diagram and measure with a protractor. but you know that the remaining angles add up to 240 degrees total... are they congruent? if so then each of them are 80 degrees.

4. There are infinite solutions without knowing at least the length of two adjacent sides of the quadrilateral.

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