If you have any query regarding NCERT Solutions for Class 7 Maths Chapter 5 Lines and Angles MCQ, drop a comment below and we will get back to you at the earliest. (а) supplementary angles (b) complementary angles (c) adjacent angles (d) vertically opposite angles. Answer: (b) (a, b) and (c, d) Lines AB and CD are intersecting each other. Angle An angle is formed when lines, rays or line segments meet. 45. x + 120° = 180° ⇒ x = 60°. Two right angles are always supplementary to each other. Vertically opposite angles, sometimes known as just vertical angles. ⇒ 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 . Cloudflare Ray ID: 61616f330cbbcdb7 What is the measure of the complement of the angle 80°? In the following figure EF || GH. 180° – 179° – 1°. Also Know, what are obtuse vertically opposite angles? Try moving the points below. 19. Two vertically opposite angles can be obtuse c. Two vertically opposite angles can be right angles d. Two vertically opposite angles may be unequal See answer jessam56250 is waiting for your help. Axis : A fixed, reference line from which locations, distances or angles are taken. 10. Summary. 1 page 2 - 6. 3. 33. A system which uses one or more numbers, or coordinates, to determine the position of a point in space e.g. An Obtuse Angle is just the opposite of an Acute Angle. They are measured in degrees (°) using a protractor. Two supplementary angles are always obtuse angles. 90° – 80° = 10°. An Angle that is greater than 90° but less than 180° is known as an Obtuse Angle. (iv) Two adjacent angles always form a linear pair. 32. 39. (a) 90° (b) 180° (c) 360° (d) none of these. Vertical Angles Theorem. (c) When a transversal cuts two parallel lines, each pair of interior angles on the same side of the transversal are supplementary. Answer: (i) 90 0 (ii) 180 0 (iii) supplementary (iv) linear pair (v) equal (vi) obtuse angles Also, a vertical angle and its adjacent angle are supplementary angles, i.e., they add up to 180 degrees. 42. (a) Two vertically opposite angles can be acute (b) Two vertically opposite angles can be obtuse (c) Two vertically opposite angles can be right angles (d) Two vertically opposite angles may be unequal. When the sum of the measures of two angles is 180°, the angles are called. The figure above illustrates an acute angle. 6. When two lines intersect each other at one point and the angles opposite to each other are formed with the help of that two intersected lines, then the angles are called vertically opposite angles. 2. 24. Tell which of the following pairs of angles need not be equal? 5. NCERT Solutions for Class 7 Maths Chapter 5 Lines and Angles MCQ, are part of NCERT Solutions for Class 7 Maths. As one acute angle and one obtuse angle can make two supplementary angles. When two lines intersect each other, then the opposite angles, formed due to intersection are called vertical angles or vertically opposite angles. ∠ DEF = ∠ DGC = ∠ ABC = 60°. Find the measure of the angle which is double of its complementary angle? Answer: (d) Two vertically opposite angles may be unequal I assume when you say vertical you mean a straight line. 18. (a) Two acute angles can be complementary to each other (b) Two obtuse angles can be complementary to each other (c) Two right angles can be complementary to each other (d) One obtuse angle and one acute angle can be complementary to each other. 120° + 60° = 180°. Examples. The sum of the measures of two supplementary angles is. Question 18. Here, the two adjacent angles are supplements. 23. (a) ∠ 1, ∠ 2 (b) ∠1, ∠ 3 (c) ∠ 1, ∠ 5 (d) ∠ 2, ∠ 8. Read more about types of angles … Asked by Wiki User. 4. An acute angle lies between 0 degrees and 90 degrees or in other words, an acute angle is one that is less than 90 degrees. 17. Notice that the 4 angles are actually two pairs of vertically opposite angles: 1. (a) When a transversal cuts two parallel lines, each pair of corresponding angles are equal. (a) Two vertically opposite angles can be acute (b) Two vertically opposite angles can be obtuse (c) Two vertically opposite angles can be right angles (d) Two vertically opposite angles may be unequal. The measure of the complement of the angle 46° is. In your case, angle 1 is acute (42°) so angle 6 must be the obtuse angle that is supplementary. Two adjacent angles can be supplementary angles. See the figure of Q. Coordinate system . Interior angles on the same side of a transversal with two distinct parallel lines are supplementary angles. An obtuse angle is a type of angle whose degree measurement is more than 90° but less than 180°. 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