classification of triangles

Summary - In a triangle the line joining a vertex to the mid point of the opposite side is called a median. The three medians of a triangle are concurrent at a point called the "Centroid". The perpendicular from a vertex to the opposite side is called the "altitude". The three a..

Theorem: - In any triangle ABC, prove that the area of a triangle ABC is given ..

We have studied that a triangle has six parts or six elements viz three sides and three angles. From geometry, we know that when any three elements are given of which necessarily a side is given, the triangle is completely determined i.e, remaining three elements can be determin..

When two triangles have (i) the same shape, and (ii) the same size, then they are said to be congruent triangles. Symbol for congruency is Draw with AB = 4 cm, AC = 5 cm, and . Also with DE = 4 cm, DF = 5 cm and Draw these triangles on a tracing paper. Now place fig(ii..

Area of a triangle - If the coordinates of the vertices of the D ABC are A(x 1 ,y 1 ), B(x 2 ,y 2 ) and C(x 3 ,y 3 ), then the area of triangle is given ..

If the coordinates of the vertices of the D ABC are A(x 1 ,y 1 ), B(x 2 ,y 2 ) and C(x 3 ,y 3 ), then the area of triangle is given ..

We have already learnt in the previous class that the area of triangle whose vertices are (x 1 , y 1 ), (x 2 , y 2 ), (x 3 , y 3 ) is given by Hence area of a triangle having vertices at (x 1 , y 1 ), (x 2 , y 2 ) and (x 3 , y 3 ) is given by..

If the coordinates of the vertices of the D ABC are A(x 1 ,y 1 ), B(x 2 ,y 2 ) and C(x 3 ,y 3 ..

Is every isosceles triangle an isosceles right triangle? => Yes or No..