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11th Class Part 1 Mathematics Chapter 12 Test Online MCQs With Answers
Question # 1
In a triangle ABC b = √3, c = 1, α = 30° then a = :
Choose an answer
2
1
3
-1
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Question # 2
In any triangle ABC, law of tangents is:
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all of these
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Question # 3
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Question # 4
In a right isoceles triangle, one acute angle is:
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30°
45°
60°
75°
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Question # 5
A triangle which is not right angle triangle called ________ triangle:
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acute
obtuse
right
oblique
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Question # 6
If the elevation of the sun is 30°, the length of the shadow cast by a tower of 150m height is:
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none
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Question # 7
If 2s = a + b + c, then in any triangle ABC:
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all of these
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Question # 8
r
3
=
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Question # 9
In 2s = a + b + , then in any triangle ABC:
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all of above
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Question # 10
The circum-radius R of a triangle is given by:
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Question # 11
In triangle the length of the sides are 7, 4√3 and √13. Then the smallest angle is:
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15°
30°
60°
45°
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Question # 12
In a triangle ABC if a
2
- b
2
+ c
2
= ac then < ß =
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Question # 13
r
1
=
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Question # 14
A circle drawn inside a triangle and touching its sides is known as:
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Question # 15
A circle which touches one side of a triangle externally and the other two produces sides internally is known as:
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Question # 16
With usual notations for triangle R equals:
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Question # 17
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Question # 18
The in-radius r of a triangle is given by:
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Question # 19
r r
1
r
2
r
3
=
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abc
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Question # 20
When two sides and included angle is given, then area of triangle is given by:
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all of these
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