18. If the slope of a line is twice the ...

18. If the slope of a line is twice the slope of other line and the tangent of the angle betwes them is find the slopes of two lines. which i 19. Prove that the diagonals of a rhombus intersect at right angle. 20. Prove that the median of an equilateral triangle is perpendicular to the corresponding side. 21. Prove that the line joining the mid-points of two sides of a triangle is parallel to the third side. Equation Let lb passes throu Let P(x

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