Observing Congruency Using Reflection

Q.

A type of transformation where an object is flipped over a line of symmetry is called

1. Reflection

2. Translation

3. Rotation

4. None of these

Q.

Triangle ABC is reflected through a mirror. The mirror image hence obtained is again reflected through the same mirror. Then the final mirror image obtained is congruent to triangle ABC.

1. False

2. True

Q.

13 and 31 is a strange pair of numbers such that their square 169 and did 961 are also Mirror image of each other can you find one other such pair

Q. Among two congruent angles, one has a measure of 70°, the measure of the other angle is ___________.

1. 70°
2. 74°
3. 68°
4. 72°

Q.

Suppose two adjacent angles are supplementary. Show that if one of them is an obtuse angle, then the other angle must be acute.

Q.

A triangle is said to be$\_\_\_\_\_\_\_$ if at least any two of its sides are of the same length. [equilateral/isosceles]

Q.

Choose the correct option:

If two angles are supplementary, then their sum is ___________

A. 90°

B. 180°

C. 270°

D. 360°

Q.

Choose the correct option:

The measure of an angle which is 5 times its supplement is ___________

A. 30°

B. 60°

C. 120°

D. 150°

Q.

A triangle is rotated through ${180}^{\circ }$ and then reflected through a vertical mirror. Then the mirror image hence obtained is congruent to the initially taken triangle.

1. True

2. False

Q.

if XY is the mirror, which among the given options is congruent to the following triangle ABC?

1. 

2. 

3. 

4. 

Q.

Which among the given options is congruent to the following triangle?

1. 

2. 

3. 

4. 

Q.

Which pair of angles are supplementary in the following diagram? Are there supplementary rays?

Q.

Did the snake admire its beauty? Yes or no? Pick the lines from the passage in support of your answer.

Q.

What is the difference between a pair of supplementary angles and a pair of complimentary angles?

Q.

Recognise the type of angles in the following figures:

(i)

(ii)

(iii)

Q.
The given coins are congruent

1. False
2. True

Q.

if the complement of an angle is 28 degree then what is the supplement of the angle ?

Q.

In the fig, suppose ∠P and ∠Q are supplementary angles and ∠R = 125°. Find the measures of ∠S.

Q.

Triangle ABC is reflected through the mirror XY as shown in the figure. Then which among the given options is congruent to triangle ABC?

1. 

2. 

3. 

4. 

Q.

If a triangle is reflected through a mirror, then the mirror image hence obtained has

1. the same shape but different size

2. the same size but different shape

3. a different shape and size

4. the same shape and size

Q.

The following triangle ABC is rotated through ${90}^{\circ }$ in anti-clockwise direction and then reflected through a vertical mirror. Then the mirror image hence obtained is not congruent to the initially taken triangle ABC.

1. True

2. False

Q.

In the following figure if XY is the mirror, then $△ABC$ congruent to $△A{B}^{\prime }{C}^{\prime }$.

1. True

2. False