Close the open corner — dial the missing angle so a triangle sums to 180° or a quadrilateral to 360°.
One corner of a triangle or quadrilateral is open, and the child dials the missing angle so the angles sum to 180° or 360°, with a meter stacking the known angles toward the total. Using the angle-sum rule builds geometric reasoning. Best for Grade 6.
A free, no-signup, no-ads math game for Grade 6 — practising angle-sum, triangle-angles, quadrilateral-angles, missing-angle, supplementary. Play in your browser on the KidsDoMath games hub or explore more Geometry & Shapes games.
By grade level: 6th Grade Math Games
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What math does Angle Sum Summit practice? Angle Sum Summit practices Angle Sum, Triangle Angles, Quadrilateral Angles, Missing Angle. One corner of a triangle or quadrilateral is open, and the child dials the missing angle so the angles sum to 180° or 360°, with a meter stacking the known angles toward the total.
What grade is Angle Sum Summit for? Angle Sum Summit is built for Grade 6 (ages 11–12). It sits in the Geometry & Shapes strand, and it ramps across 8 levels so younger or older players find their own pace.
How do you play Angle Sum Summit? Close the open corner — dial the missing angle so a triangle sums to 180° or a quadrilateral to 360°.
Is Angle Sum Summit free to play? Yes. Angle Sum Summit is free, with no ads and no sign-up, and it runs in the browser on a phone, tablet or computer.