Chapter 6 MATHS : Lines and Angles — Online MCQ Test
MATHS · CLASS 9th · Andhra State Board
Practice Chapter 6 MATHS : Lines and Angles with a free chapter-wise online MCQ test.
This chapter covers: This chapter details basic definitions intersecting non-intersecting lines angle pairs linear pair axiom and properties of parallel lines..
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Chapter 6 MATHS : Lines and Angles — Important Questions & Answers
What is the sum of two adjacent angles if they form a linear pair?
- A. 90 degrees
- B. 180 degrees
- C. 360 degrees
- D. 270 degrees
Answer: B. 180 degrees
By the Linear Pair Axiom, if two adjacent angles form a linear pair, then their sum is 180 degrees.
By the Linear Pair Axiom, if two adjacent angles form a linear pair, then their sum is 180 degrees.
If two lines intersect each other, then the vertically opposite angles are ________.
- A. Equal
- B. Complementary
- C. Supplementary
- D. Unequal
Answer: A. Equal
The Vertically Opposite Angles theorem states that if two lines intersect, the vertically opposite angles are equal.
The Vertically Opposite Angles theorem states that if two lines intersect, the vertically opposite angles are equal.
If an angle is 20 degrees more than its complement, find the angle.
- A. 45 degrees
- B. 55 degrees
- C. 35 degrees
- D. 65 degrees
Answer: B. 55 degrees
Let the angle be x. Then x = (90 - x) + 20. Solving this, 2x = 110, so x = 55 degrees.
Let the angle be x. Then x = (90 - x) + 20. Solving this, 2x = 110, so x = 55 degrees.
If two angles are complementary, the sum of their measures is:
- A. 90 degrees
- B. 180 degrees
- C. 360 degrees
- D. 45 degrees
Answer: A. 90 degrees
By definition, two angles are complementary if their sum is 90 degrees.
By definition, two angles are complementary if their sum is 90 degrees.
If angle x and y are supplementary and in ratio 1:5, what is the measure of angle y?
- A. 30 degrees
- B. 150 degrees
- C. 120 degrees
- D. 60 degrees
Answer: B. 150 degrees
x + 5x = 180 => 6x = 180 => x = 30. Angle y = 5x = 150 degrees.
x + 5x = 180 => 6x = 180 => x = 30. Angle y = 5x = 150 degrees.