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11th Class FA Mathematics Chapter 12 Online Test MCQs With Answers
Question # 1
With usual notations for triangle R equals:
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Question # 2
In a triangle ABC if a
2
- b
2
+ c
2
= ac then < ß =
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Question # 3
In a right isoceles triangle, one acute angle is:
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30°
45°
60°
75°
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Question # 4
If 2s = a + b + c, then in any triangle ABC:
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all of these
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Question # 5
The lengths of the sides of a triangle are proportional to the sines of the opposite angles to the sides. This is known as:
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The law of sines
The law of cosines
The law of tangents
The fundamental law
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Question # 6
r
3
=
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Question # 7
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Question # 8
If α, ß, Γ are the angles of a oblique triangle, then:
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α = 90°
ß = 90°
Γ = 90°
none of these
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Question # 9
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Question # 10
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 # 11
r
2
=
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Question # 12
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 # 13
In triangle ABC, If Γ = 90° then:
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b = c + a
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Question # 14
In a triangle ABC, (s - a)(s - b) = s(s - c), then the angle Γ =
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Question # 15
A circle passing though the vertices of a triangle is known as:
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Question # 16
In triangle ABC, if α = 90° then:
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none of these
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Question # 17
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r
1
r
2
r
3
r
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Question # 18
In a triangle ABC b = √3, c = 1, α = 30° then a = :
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2
1
3
-1
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Question # 19
A circle drawn inside a triangle and touching its sides is known as:
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Question # 20
If 2s = a + b +c, then in any triangle ABC:
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none of these
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