# Ex 14.5, 4 - Chapter 14 Class 11 Mathematical Reasoning

Last updated at May 29, 2018 by Teachoo

Last updated at May 29, 2018 by Teachoo

Transcript

Ex 14.5, 4 By giving a counter example, show that the following statements are not true. p: If all the angles of a triangle are equal, then the triangle is an obtuse angled triangle. Since all angles of triangle are equal, each angle is 60° But no angle greater than 90° So this triangle is not obtuse angled triangle Hence the given statement is false Ex14.5, 4 By giving a counter example, show that the following statements are not true. (ii) q: The equation x2 – 1 = 0 does not have a root lying between 0 and 2. Putting x = 1 in equation x2 – 1 = (1)2 – 1 = 1 – 1 = 0 Hence x = 1 be the root of x2 – 1 & x is lying between 0 & 2 Hence the given statement is not true.

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