Define a triangle.

Define : Equiangular triangles

How do we define perimeter of a triangle?

define acute angled and obtuse angled triangles. Let’s draw the triangles and measure

Define an equivalence relation. Show that the relation similarity on the set of all triangles in a plene is an equivalence relation.

Explain the following terms: Triangle (ii) parts or elements of a triangle Scalene triangle (iv) isosceles triangle Equilateral triangle (vi) acute triangle Right triangle (viii) obtuse triangle Interior of a triangle (x) exterior of a triangle.

Given that triangle ABC~triangle PQR , CM and RN are respectively the medians of similar triangles triangle ABC and triangle PQR . Prove that triangle CMB ~ triangle RNQ

Given that triangle ABC~triangle PQR , CM and RN are respectively the medians of similar triangles triangle ABC and triangle PQR . Prove that triangle AMC ~ triangle PNR