...CD. What other lines are parallel ? [HINT. See §§ 3, 45, 54.] 10. Prove that the median (see § 33) to the base of an isosceles triangle is perpendicular to the base. 11. Prove that if a median in any triangle is perpendicular to the base to which it is drawn, the triangle...

...CD. What other lines are parallel? [HINT. See §§ 3, 45, 54.] 10. Prove that the median (see § 33) to the base of an isosceles triangle is perpendicular to the base. 11. Prove that if a median in any triangle is perpendicular to the base to which it is drawn, the triangle...

...angle. Ex. 20. The diagonals of an equilateral quadrilateral are perpendicular to each other. Ex. 21. The median to the base of an isosceles triangle is perpendicular to the base. Ex. 22. In quadrilateral A BCD, if AB = BC, and CD = DA, then BD _L AC. c Ex. 23. If AC = BC, and AO =...

...definition for the name of the thing defined. Thus instead of thinking too long about proving that the median to the base of an isosceles triangle is perpendicular to the base, let him draw the figure and think that there is given c AC = EC, AD = BD, and that there is to be proved...

...probably sick" is the conclusion. • PROBLEM 6 Identify the hypothesis and conclusion in the statement, "The median to the base of an isosceles triangle is perpendicular to the base." Solution; The statement dealt with in this problem is a "simple" sentence, as opposed to the "if-then"...

...Prove that the altitudes of a triangle are concurrent. (Andhra, 1986 ; Raipur, 1986) 10. Prove that the median to the base of an isosceles triangle is perpendicular to the base. 11. Prove that the sum of the squares of the diagonals of a parallelogram is equal to the sum of the...