...rectangle equal in area to the parallelogram and having for one of its diagonals the line AC. [Hint. Triangles on the same base and between the same parallels are equal in area.] 7. (a) If the base of a triangle is 2 in. and its altitude is 1 J in., state clearly what...

...depends only on its base and altitude. [Exercises 7 (a) and 7 (6) may now be taken.] Theorem 5 a. (i) Triangles on the same base and between the same parallels are equal in area. (ii) Conversely, if two triangles with equal areas stand on the same side of a common base,...

...respectively, find the length of the radius of the inscribed circle. 16. Prove that parallelograms, and also triangles, on the same base and between the same parallels, are equal in area. L and M are two given parallel straight lines, and P and Q two given points. Show how to draw...