Introduction to Analytic Geometry

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Side 90 - The line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of the third side.
Side 59 - A point moves so that the sum of the squares of its distances from the points (0, 0), (1, 0) is constant.
Side 58 - Find the equation of the locus of a point which moves so that its distances from (8, 0) and (2, 0) are always in a constant ratio equal to 2.
Side 59 - In the proofs of the following theorems the choice of the axes of coordinates is left to the student, since no mention is made of either coordinates or equations in the problem. In such cases always choose the axes in the most convenient manner possible.
Side 58 - The locus of a point, the sum of the squares of whose distances from n fixed points is constant, is a circle.
Side 34 - Prove that the middle point of the hypotenuse of a right triangle is equidistant from the three vertices.
Side 202 - Ex. 1. Find the equation of the locus of a point whose distance from Pi(3, 0, -2) is 4.
Side 78 - N6 is to say that if two nonvertical lines are perpendicular, then the slope of one is the negative reciprocal of the slope of the other.
Side 58 - A point moves so that the difference of the squares of its distances from two fixed points is constant. Show that the locus is a straight line. Hint. Draw XX' through the fixed points, and YY/ through their middle point.
Side 22 - The projection of a point upon a line is the foot of the perpendicular from the point to the line. 329. DEF. The projection of one line upon another is the segment between the projections of the extremities of the first line upon the second. A' / ri U/ A A B' A

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