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From Karnataka Open Educational Resources
→Concept 4: Construction of triangles
====== [[Relation between interior and exterior angles in triangle|Exterior angle theorem:]] Relation between angles formed inside a triangles and angles outside a triangle ======
====== [[Relation between interior and exterior angles in triangle|Exterior angle theorem:]] Relation between angles formed inside a triangles and angles outside a triangle ======
==== Concept 4: Construction of triangles ====
==== Concept 4: Construction of triangles ====
Constructing geometric shapes to precision using a scale and a compass helps in understanding of properties of the shape. Constructing geometric shapes with minimum number of parameters enhances thinking skills.
Elements of triangles are used in the following constructions where constructions are based on minimum number of parameters required.
===== Activities =====
====== [[Construction of a triangle with 3 sides|Construction of a triangle with three sides:]] ======
====== [[Construction of a triangle with two sides and included angle|Construction of a triangle with two sides and an angle]]: ======
====== [[Construction of a triangle with two angles and included side]]: ======
====== [[Construction of a right triangle with a side and hypotenuse|Construction of a right angled triangle]]: ======
====== [[Construction of a triangle with perimeter and base angles]]: ======
====== [[Construction of a triangle with side, angle and sum of other two sides|Construction of a triangle with a side, an angle and sum of two sides]]: ======
====== [[Construction of a triangle with side, angle and difference of other two sides|Construction of a triangle with a side, an angle and difference to two sides:]] ======
==== Concept 5: Concurrency in triangles ====
==== Concept 5: Concurrency in triangles ====
