Mathematics
Fill in the blanks :
(i) An angle whose measure is more than 180° but less than 360° is called a …………… .
(ii) A straight line that intersects two or more lines in a plane is called a …………… .
(iii) A pair of adjacent angles is said to be a …………… if these angles have one arm common and other arms as opposite rays.
(iv) Two intersecting lines make …………… pairs of vertically opposite angles.
(v) Two lines are said to be …………… to each other if they intersect at right angles.
Answer
(i) An angle whose measure is more than 180° but less than 360° is called a reflex angle.
(ii) A straight line that intersects two or more lines in a plane is called a transversal.
(iii) A pair of adjacent angles is said to be a linear pair if these angles have one arm common and other arms as opposite rays.
(iv) Two intersecting lines make two pairs of vertically opposite angles.
(v) Two lines are said to be perpendicular to each other if they intersect at right angles.
Related Questions
The value of x in the given figure is
- 24°
- 28°
- 36°
- 42°
In the given figure, AB || CD. If ∠BNO = 128° and ∠COM = 56°, then ∠MON is
- 52°
- 64°
- 72°
- 84°
Write true (T) or false (F) :
(i) An angle whose measure is 90° is called a straight angle.
(ii) The sum of the angles of a linear pair is 180°.
(iii) When two straight lines cut each other, the sum of any two adjacent angles formed is 180°.
(iv) A line which intersects two other lines at their point of intersection is called a transversal.
(v) When two parallel lines are cut by a transversal, then the exterior opposite angles are supplementary.
Mohit has a complex collection of lines drawn in a plane. He studies the angles formed due to the intersection of these lines. It is known that ∠DOH = 90°.
(1) Which of the following is a pair of vertically opposite angles ?
- ∠AOC, ∠BOG
- ∠BOG, ∠BOD
- ∠COE, ∠FOH
- ∠EOG, ∠FOH
(2) Which of the following is a pair of perpendicular lines ?
- AB, CD
- CD, GH
- AB, EF
- EF, GH
(3) Which of the following is a pair of complementary angles ?
- ∠AOC, ∠COE
- ∠COE, ∠EOG
- ∠EOG, ∠FOH
- ∠COG, ∠DOH
(4) Which of the following is a pair of supplementary angles ?
- ∠COE, ∠DOF
- ∠BOF, ∠AOH
- ∠AOE, ∠BOE
- ∠AOD, ∠BOG