Which statements about angles and geometric figures are true? Check all that apply.

A quadrilateral’s interior angles add up to 360°, so C is true. A triangle’s interior angles add up to 180°, so D is true, and a right angle measures exactly 90°, so E is true. The other statements are false: an obtuse angle is greater than 90° and less than 180°, and two right angles would already total 180°, leaving no angle for a triangle’s third angle.

AI-written and checked against the verified answer.