ABCD is a parallelogram of area 48 cm². Find the area of triangle ABC.

Prove that a parallelogram and a triangle on the same base and between the same parallels have areas in the ratio 2 : 1.

Triangles on the same base and between the same parallels are:

Prove that a median of a triangle divides it into two triangles of equal area.

State the relation between the area of a triangle and that of a parallelogram on the same base and between the same parallels.

State the theorem about the areas of parallelograms on the same base and between the same parallels.

Factorise x⁴ − 81.