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Angel Sum Property of Triangle

Angel Sum Property of Triangle

Product Code : EL-MLE-11134

Quick Answer: The Angle Sum Property of Triangle is a maths manipulative made up of a triangle with cut-outs of its interior angles. Students use it to investigate the angle sum property and the link between interior and exterior angles.

Last updated: October 2026

Key Features

  • Triangle supplied with cut-outs of its interior angles
  • Shows experimentally that an exterior angle equals the sum of the two interior opposite angles
  • Helps students grasp the idea of a straight angle
  • Can also be used for demonstration on a magnetic board

About This Product

By placing the cut-out angles side by side, a child can see that the three interior angles of a triangle fill a straight line. The same pieces show that each exterior angle matches the two opposite interior angles, so the property is verified by hand rather than taken on trust.

Frequently Asked Questions

Can the Angle Sum Property of Triangle be used on a magnetic board?

Yes. The source states it can also be used to demonstrate on a magnetic board.

Related: Math Lab Equipments, Angel Property of Cyclic Quadrilateral and Circle Kit.

For a quotation on the Angel Sum Property of Triangle, contact Educational Instrument.

   
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