2014 · Q68
For the next two (2) items that follow: ABCD is a trapezium in which AB is parallel to CD. Let M be the midpoint of BC. Consider the following statements:
- 1'Area of triangle ADM + Area of triangle DCM' is equal to three-fourth of the area of trapezium ABCD, if AB = CD.
- 2'Area of triangle DCM + Area of triangle ABM' is always greater than half of the area of trapezium ABCD.
Which of the above statements is/are correct?
Elementary MathematicsQuadrilaterals and Polygons
- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1 nor 2
Explanation
If AB = CD = b with height h: area(ADM) = bh/2, area(DCM) = bh/4, sum = 3bh/4 = 3/4 of the trapezium area 2bh/2... = bh; statement 1 holds, while area(DCM) + area(ABM) = bh/4 + bh/4 = bh/2, not exceeding half — statement 2 fails.