Interior angles in a triangle add up to 180Ëš. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to ...
Take a look at this shape. Let's work out the missing angle labelled 'd'. You know that all the angles in this quadrilateral should add up to 360°. Three angles are labelled - 100°, 70° and 30°.
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