MISSING INTERIOR ANGLES
Instructions: The interior angles total 180° in a triangle and 360° in a quadrilateral. Choose Triangles, Quadrilaterals, or Mixed. Foundation: calculate one missing angle (multiples of 10°). Core: solve missing angles and simple equations (multiples of 5°). Challenge: use whole-degree angles, multiple expressions, and angle relationships; sometimes solve for x and then find a particular angle. The diagrams are not drawn to scale. Enter the value requested above each diagram. Get 3 correct answers to unlock the next level.
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Student Mode lets you work without a countdown. Incorrect answers reveal the correct answer and a teaching hint. Press Enter or Next when you are ready to continue.
Time:
FOUNDATION MODE
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CORE MODE
CHALLENGE MODE