

InterviewSolution
Saved Bookmarks
1. |
In the figure, seg AB || Y-axis and seg CB || X-axis. Co-ordinates of points A and C are given. To find AC, fill in the boxes given below. |
Answer» In ∆ABC, ∠B = 900 ∴ (AB)2 + (BC)2 = [(Ac)2 …(i) … [Pythagoras theorem] seg CB || X-axis ∴ y co-ordinate of B = 2 seg BA || Y-axis ∴ x co-ordinate of B = 2 ∴ co-ordinate of B is (2, 2) = (x1, y1) co-ordinate of A is (2, 3) = (x2, y2) Since, AB || to Y-axis, d(A, B) = Y2 – Y1 d(A,B) = 3 – 2 = 1 co-ordinate of C is (-2, 2) = (x1, y1) co-ordinate of B is (2, 2) = (x2, y2) Since, BC || to X-axis, d(B, C) = x2 – x1 d(B,C) = 2 – -2 = 4 ∴ AC2 = 12 + 42 …[From (i)] = 1 + 16 = 17 ∴ AC = √17 units …[Taking square root of both sides]. |
|