Q1 of 158 Page 159

The sides of a triangle have lengths (in cm) 10, 6.5 and a, where a is a whole number. The minimum value that a can take is

Given: Length of sides of triangle = 10,6.5,a


Formula Used/Theory:-


Sum of 2 sides of triangles is always greater than 3rd side of triangle


6.5 + a>10


a>10 - 6.5


a>3.5


‘a’ must be greater than 3.5


∴ the minimum value above 3.5 can be taken from option is 4

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2

Triangle DEF of Fig. 6.6 is a right triangle with ∠E = 90°.


What type of angles are ∠D and ∠F?

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In Fig. 6.7, PQ = PS. The value of x is

 4

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In an isosceles triangle, one angle is 70°. The other two angles are of

(i) 55° and 55°


(ii) 70° and 40°


(iii) any measure


In the given option(s) which of the above statement(s) are true?