Q.21. Find the area of a rhombus ABCD if its vertices are A (3, 0), B (4, 5), C (– 1, 4) and D (– 2, – 1). Sol. See Q.17, 2008 (II Comptt. Delhi).
Q. 22. Show that (– 2, 3), (8, 3) and (6, 7) are the vertices of a right-angled triangle.
Sol.
Let A (– 2, 3), B (8, 3) and C (6, 7) Using distance formula A (-2, 3)
Q. 23. In Figure 3, a quadrilateral ABCD is drawn to circumscribea circle. Prove that AB + CD = AD + BC.
Sol. See Q.28 (Part II), 2004 (I Comptt. Delhi) and Q.27, 2008 (III Delhi).
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