calculating area of a triangle

Calculate the area of triangle ABC in the figure shown, if the area of the rectangle BCDE is 80 in. 2 . => 4 in. 2 or 82 in. 2 or 160 in. 2 or 40 in. 2..

is the area of the same region. Note that any one of the processes, viz., taking the left hand end-points or the right hand end-points will be sufficient for calculating the desired area..

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

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 ..

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 ), 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 ..

Which of the triangles in the figure have equal areas? => 1 and 2 or 2 and 3 or 1 and 3 or 1, 2 and 3..

What is the area of the triangle? => 220 ft 2 or 110 ft 2 or 220 ft or 110 ft..

What is the area of the triangle? => 21 cm 2 or 24 cm 2 or 22 cm 2 or 23 cm 2..