If two angles are supplementary then one must be acute and the other obtuse or both right angles. (b) Two adjacent angles cannot be supplementary Inner scale is also marked in degrees from 0 to 180 but from right to left. (a) When a transversal cuts two lines, such that pairs of corresponding angles are equal, then the lines have to be parallel. Question 1. Answer: (a) 30° When two lines intersect each other, then the opposite angles, formed due to intersection are called vertical angles or vertically opposite angles. Symbol for an angle is ∠. Required fields are marked *, Concise Mathematics Class 10 ICSE Solutions 2018. Answer: (a) 60° Ans : False 4. (c) 60° The two vertically opposite angles are equal. Which of the following statements is false? Question 41. What is value of the supplementary angle of an angle measuring 75°? Question 42. True or False. (c) 60° ∠2 + ∠4 = 360°- (∠1 + ∠3) = 360°- 120° = 240°, Question 40. Filed Under: MCQ Questions Tagged With: NCERT Solutions for Class 7 Maths, Your email address will not be published. In this example a° and b° are vertically opposite angles. Hint: The measure of the supplement of the angle 90° is (a) 45° (b) 60° (c) 30° (d) 90°. Thus ∠ABC = 50°. Two angles whose sum is 90 degrees are called Complementary Angles Two angles whose sum is 180 degrees are called Supplementary Angles (iii) Two obtuse angles can form a linear pair. In the following figure, tell which pair of angles are not corresponding angles? (a) 45° Question 3: Look at the figure below. ∠ACD +∠DCB = 90° Answer: (c) 300° - .-- true. (d) ∠2 + ∠6 = 180°. Which of the following statements is true? (c) 65° (a) complementary angles Also, a vertical angle and its adjacent angle are supplementary angles, i.e., they add up … 10. Step 2: Place the protractor correctly ... Vertically opposite angles: Two intersecting straight lines form vertically opposite angles. 25. 23. The angles opposite each other when two lines cross. See the figure of Q. Answer: (d) 160°, 30° (c) ∠3, ∠7 (a) When a transversal cuts two parallel lines, each pair of corresponding angles are equal. (a) 30° Also, recall that a straight angle is equal to 180°. The standard unit of measuring an angle is degree. Question 67. As ∠β =120°, ∠ α = 180-120 = 60°. (a) 60° In the following figure, a transversal c intersects two parallel lines a and b at A and B respectively and the angles formed at A and B are marked. (c) ∠3 + ∠8 = 180° 32° + 58° = 90° ≠ 180°. no common arms are called vertically opposite angles. (b) When a transversal cuts two lines such that pairs of alternate interior angles are equal, then the lines have to be parallel. TRUE/FALSE DIRECTION : Read the following statements and write your answer as true or false. This is the measurement of ∠ABC. We hope the given NCERT MCQ Questions for Class 7 Maths Chapter 5 Lines and Angles with Answers Pdf free download will help you. (d) 180°. (d) 120°. Introduction to Point, Ray, Line and Line-Segment, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Reddit (Opens in new window). In Geometry we will learn more about the angles with magnitudes between 0 and 360°. (b) 0° ⇒ Since an obtuse angle is less than 1 8 0 o , the sum of 2 obtuse angles will always be less than 3 6 0 o . An obtuse angle is between and . ∴ ∠4 = 180° – 50° = 130°. Question 43. Hint: We have provided Lines and Angles Class 7 Maths MCQs Questions with Answers to help students understand the concept very well. (c) 60° Outer scale is marked in degrees from 0 to 180 from left to right. The measure of the supplement of the angle 179° is An Interior Angle is an angle formed inside a geometric shape. (b) Two obtuse angles can form a linear pair It has a base line at the bottom. An angle measures the amount of turn. opp. Students can solve NCERT Class 7 Maths Lines and Angles MCQs Pdf with Answers to know their preparation […] It is also called semi-circular protractor. (b) supplementary angles Question 8. Hint: Hence, two obtuse angles can be adjacent angles. State whether the following statements are true (T) or false (F): (i) Two obtuse angles can be supplementary. 16. Hint: (b) 180° Learn vocabulary, terms, and more with flashcards, games, and other study tools. Adjacent angles are two angles that are side by side and share a common ray. (b) ∠1, ∠3 (d) none of these. ∠3, ∠5 are alternate interior angles. The size of an angle depends on the extent of rotation. (c) adjacent angles (d) 136°, Answer: (b) 46° When the sum of the measures of two angles is 90°, the angles are called (d) Complementary angles are always adjacent. (b) 120° Question 32. 2. If one complete rotation is divided into 360 equal parts, the measure of each such part is one degree or 1°. (c) Two obtuse angles can be supplementary. (c) 45° How to solve: True or False? An obtuse angle is more than 90 but less than 180 degrees. (a) Two acute angles can be complementary to each other When measuring an angle, the centre of the protractor is placed over the vertex (corner) B of the angle and the base line of the protractor is placed along one of the lines of the angle BC. 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(d) 90°, Question 14. (d) 60°. n (b) Supplement of a right angle is a right angle. Understanding Trigonometric Ratios With Application to Triangles – Maths Tips. (b) 66°, 34° x° + x° = 90° ⇒ x° = 45°. True or False. State true or false: If two lines intersect and if one pair of vertically opposite angles is formed by acute angles, then the other pair of vertically opposite angles will be formed by obtuse angles. The two vertically opposite angles are always equal. Question 19. Then, the measure of ∠x is equal to 1 . Thus, 30 degree and 60 degree are written as 30° and 60° respectively. x° = $$\frac { 1 }{ 2 }$$(180° – x°) ⇒ x° = 60°. Which pair of the following angles are complementary? (c) 360° The angle measures the amount of turn between the two arms two and is usually measured in degrees or radians. 5. Two vertically opposite angles are always equal. Answer: (d) ∠3, ∠5 (а) ∠1 + ∠2 = 180° Two angles whose sum add to 90 degrees are called Complementary Angles. 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