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Class 9 Maths
Lines And Angles
Quiz 1
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In ΔABC, ∠A = 50° and the external bisectors of ∠B and ∠C meet at O as shown in figure. The measure of ∠BOC is
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40°
0%
65°
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115°
0%
140°
Explanation
65°
In figure the value of x is
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120°
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130°
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110°
0%
100°
Explanation
130°
An exterior angle of a triangle is 80° and the interior opposite angles are in the ratio 1 : 3, measure of interior opposite angles are
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30°, 90°
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40°, 120°
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20°, 60°
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30°, 60°
Explanation
20°, 60°
In ΔABC, the bisectors of ∠ABC and ∠BCA intersect each other at O. The measure of ∠BOC is
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90° + ∠A
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90° + \(\frac{∠A}{2}\)
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180 - ∠A
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90° - \(\frac{∠A}{2}\)
Explanation
90° + \(\frac{∠A}{2}\)
In figure if ∠A + ∠B + ∠C + ∠D + ∠E + ∠F = k right angles, then find value of k.
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2
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3
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4
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5
Explanation
4
In the given figure, the measure of ∠ABC is
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80°
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20°
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100°
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60°
Explanation
80°
The angle of a triangle are in the ratio 5 : 3 : 7, the triangle is
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an acute-angled triangle
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an obtuse angled triangle
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an right angled triangle
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an isosceles triangle.
Explanation
an acute-angled triangle
In figure l
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|| l
2
, the value of x is
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80°
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100°
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110°
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70°
Explanation
80°
If one angle of triangle is equal to the sum of the other two, then the triangle is
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an isosceles triangle
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an obtuse-angled triangle
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an equilateral triangle
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a right triangle
Explanation
a right triangle
One of the angles of a triangle is 75°. If the difference of other two is 35°, then the largest angle of other two angles has a measure
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80°
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75°
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70°
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135°
Explanation
70°
An exterior angle of a triangle is 105° and its two interior opposite angles are equal. Each of these equal angles is
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37 \(\frac{1°}{2}\)
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52 \(\frac{1°}{2}\)
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72 \(\frac{1°}{2}\)
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75°
Explanation
52 \(\frac{1°}{2}\)
In Figure measure of ∠ABC is
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60°
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70°
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80°
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50°
Explanation
60°
In Figure AB || CD, the value of x is
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35°
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40°
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60°
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75°
Explanation
75°
In the figure, PS ⊥ l, RQ ⊥ l, the degree measure of y is
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55°
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90°
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80°
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135°
Explanation
80°
Each angle of an equilateral triangle is
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50°
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90°
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54°
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60°
Explanation
60°
Given lines l
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|| l
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and l
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|| l
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in figure. The value of x is
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40°
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140°
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50°
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80°
Explanation
140°
In figure, find the value of y.
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28°
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40°
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140°
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56°
Explanation
28°
In the given figure, if AOB is a straight line, then ∠BOC is
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80°
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70°
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60°
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20°
Explanation
80°
Which one of these is false?
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In a linear pair,if one angle is acute ,other will be obtuse
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The sum of the angles of the triangle is 180°
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Angles forming a linear pair are supplementary
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None of the above
When two lines intersect each other ,which one of the following is true
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Vertically opposite angles are equal
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adjacent angles are complementary
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Vertically opposite angles are supplementary
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None of these
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