9th Grade > Mathematics
LINES AND ANGLES MCQs
Lines And Angles
Total Questions : 74
| Page 3 of 8 pages
Answer: Option B. -> Yes, 45∘
:
B
Let the measure of each angle be x.
Since the angles are complementary, their sum will be 90°.
⇒x+x=90∘
⇒2x=90∘
⇒x=45∘
∴ It is possible to have a pair of equal angles that are complementary and measure of each of them will be 45∘.
:
B
Let the measure of each angle be x.
Since the angles are complementary, their sum will be 90°.
⇒x+x=90∘
⇒2x=90∘
⇒x=45∘
∴ It is possible to have a pair of equal angles that are complementary and measure of each of them will be 45∘.
Answer: Option B. -> False
:
B
Obtuse angles are greater than 90∘ . So, the sum of two such angles will be greater than 180∘.
Therefore,two obtuse angles cannotbe supplementary.
:
B
Obtuse angles are greater than 90∘ . So, the sum of two such angles will be greater than 180∘.
Therefore,two obtuse angles cannotbe supplementary.
Answer: Option B. -> False
:
B
Two lines can intersect at one point only.
If they are coincident, then they will have infinite number of commonpoints
:
B
Two lines can intersect at one point only.
If they are coincident, then they will have infinite number of commonpoints
Answer: Option B. -> False
:
B
A line segment is a part of a line that is bounded by two distinct end points.
A ray starts at a point and extends infinitely in one direction.
A line extends in both directions infinitely.
:
B
A line segment is a part of a line that is bounded by two distinct end points.
A ray starts at a point and extends infinitely in one direction.
A line extends in both directions infinitely.
Answer: Option A. -> I, II, III
:
A
If two angles are complementary,then the sum of the angles will be90∘.
:
A
If two angles are complementary,then the sum of the angles will be90∘.
Answer: Option C. -> l ∥ m ∥ n
:
C
Distance between a pair of any two parallel lines remains the same throughout.
If l ∥ m and m ∥ n then l ∥ m ∥ n.
:
C
Distance between a pair of any two parallel lines remains the same throughout.
If l ∥ m and m ∥ n then l ∥ m ∥ n.
Answer: Option A. -> ∠1 + ∠8 = 180∘
:
A
From Euclid's 5th postulate, we know,
"If a straight line falling on two straight lines makes the interior angles on the same side of it taken together is less than two right angles, then the two straight lines, if produced infinitely, meet on that side on which the sum of the angles is less than two right angles."
⇒ If the lines are parallel, the sum of those two angles is 180∘.
∴∠1 + ∠8 = 180∘and∠3+ ∠6= 180∘
:
A
From Euclid's 5th postulate, we know,
"If a straight line falling on two straight lines makes the interior angles on the same side of it taken together is less than two right angles, then the two straight lines, if produced infinitely, meet on that side on which the sum of the angles is less than two right angles."
⇒ If the lines are parallel, the sum of those two angles is 180∘.
∴∠1 + ∠8 = 180∘and∠3+ ∠6= 180∘
Answer: Option B. -> 15
:
B
A line segment is a part of a line that is bounded by two distinct end points.
In the given figure, number of line segments used = 15
:
B
A line segment is a part of a line that is bounded by two distinct end points.
In the given figure, number of line segments used = 15
Answer: Option A. -> Increases by same amount
:
A
Vertically opposite angles are equal. If one angle increases then vertically opposite angle will increase by same amount.
:
A
Vertically opposite angles are equal. If one angle increases then vertically opposite angle will increase by same amount.
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