Selina Concise Mathematics Class 9 ICSE Solutions Area Theorems [Proof and Use] Selina ICSE Solutions for Class 9 Maths Chapter 16 Area Theorems [Proof and Use] Exercise 16(A) 1. In the given figure, if area of triangle ADE is 60 cm2, state, given reason, the area of : (i) Parallelogram ABED; (ii) Rectangle ABCF; (iii) Triangle ABE. Solution 1: 2.The given figure shows a rectangle ABDC and a parallelogram ABEF; drawn on opposite sides of AB. Prove that: (i) Quadrilateral CDEF is a parallelogram; (ii) Area of quad. CDEF = Area of rect. ABDC + Area of // gm. ABEF. Solution 2: Since from the figure, we get CD//FE therefore FC must parallel to DE. Therefore it is proved that the quadrilateral CDEF is a parallelogram. Area of parallelogram on same base and between same parallel lines is always equal and area of parallelogram is equal to the area of rectangle on the same base and of the same altitude i.e, between same parallel lines. So Area of CDEF= ...
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