What condition MUST be satisfied at every vertex for a set of polygons to tile a 2D plane perfectly?

Type: MCQ • Marks: 1

A. All shapes must be red and blue.

B. The perimeter of shapes must be equal.

C. The sum of side lengths must be 100 cm.

D. The sum of interior angles meeting at the vertex must be exactly 360°.

Explanation

Angles around a point in a plane sum to 360°, so tiling shapes around a vertex must sum to 360° without gap or overlap.

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Class 7th Ganita Prakash 2

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