Exemplar Exercise Problems I — task. Mathematics CBSE, Class 9.

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1. In Fig., if

$AB || CD || EF$ ,

$PQ || RS$ ,

$∠RQD = 25^°$ and

$∠CQP = 60^°$ , then

$∠QRS$ is equal to

YCIND_240306_6084_lines and angles_5.png

$85^{\circ}$
$110^{\circ}$
$145^{\circ}$
$135^{\circ}$

2. If one angle of a triangle is equal to the sum of the other two angles, then the triangle is

an isosceles triangle
an obtuse triangle
a right triangle
an equilateral triangle

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