Q. 20. Prove that.
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) UsingdistanceformulaA(-2, 3)
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