Figures on the same base and between the same parallels

Triangles on the same base and between the same parallels are equal in area.

Prove that two triangles on the same base and between the same parallels are equal in area.

Which of the following figures lie on the same base and between the same parallels ?

Which of the following figures lie on the same base and between the same parallels?

Which of the following figures lie on the same base and between the same parallels. Insuch a case, write the common base and the two parallels.

Which of the following figures lie on the same base and between the same parallels. In such a case, write the common base and the two parallels.

Which of the following figures lie on the same base and between the same parallels? In such a cases, write the common base and the two parallels.