Test: Lines And Angles - 2


20 Questions MCQ Test Mathematics (Maths) Class 7 | Test: Lines And Angles - 2


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QUESTION: 1

In a right angled triangle where angle A= 90° and AB=AC. What are the values of angle B.      

Solution:

∵ In ∆ABC,
AB = AC
∴ ∠B = ∠C    ...(1)
| Angles opposite to equal sides of a triangle are equal
In ∆ABC,
∠A + ∠B + ∠C = 180°
| Sum of all the angles of a triangle is 180°
⇒ 90° + ∠B + ∠C = 180°
| ∵ ∠A = 90° (given)
⇒    ∠B + ∠C = 90°    ...(2)
From (1) and (2), we get
∠B = ∠C = 45°.

QUESTION: 2

In figure pair of alternate exterior angles arw :

Solution:
QUESTION: 3

What is the supplement of 105°      

Solution:

Supplementary angles sums up to 180° x + 105° = 180° x=180° - 105° = 75°

QUESTION: 4

What is the measure of the complement of 45°?

Solution:

Complementary angle sums up to 90°. So x+ 45° = 90°
x = 90° - 45° = 45°

QUESTION: 5

What is the measure of the complement of 65°?

Solution:
QUESTION: 6

What is the measure of the complement of 41°?

Solution:
QUESTION: 7

What is the measure of the supplement of 54°?

Solution:
QUESTION: 8

Identify which of the following pairs of angles are complementary.

Solution:
QUESTION: 9

Identify which of the following pairs of angles are supplementary.

Solution:
QUESTION: 10

Find the angle, which is equal to its complement.

Solution:

Complementary angles sums up to 90° since 45° + 45° = 90, 45 is complementary to itself

QUESTION: 11

Lines l║m, t is transversal then ∠ x ?

Solution:
QUESTION: 12

Find the angle, which is equal to its supplement.

Solution:

Supplementary angles sums up to 180° since 90° + 90° = 180°, 90° is supplementary to itself

QUESTION: 13

Lines l║m, t is transversal then ∠ x = ?

Solution:

120 and x are corresponding angles and corresponding angles are equal so x = 120°

QUESTION: 14

Lines l║m, t is transversal then ∠ z = ?

Solution:

The angles are co-interior so x+60 = 180
x=120°

QUESTION: 15

Lines l║m, t is transversal then ∠ x = ?

Solution:
QUESTION: 16

ABC is a right angled triangle in which ∠A = 90° and AB = AC. Find ∠B and ∠C.

Solution:

Given,
∠A = 90° and AB = AC
A/q,
AB = AC 
⇒ ∠B = ∠C (Angles opposite to the equal sides are equal.)
Now,
∠A + ∠B + ∠C = 180° (Sum of the interior angles of the triangle.)
⇒ 90° + 2∠B = 180°
⇒ 2∠B = 90° 
⇒ ∠B = 45°
Thus, ∠B = ∠C = 45°

QUESTION: 17

The measures of an angle supplement to the angle of 70° is ______.

Solution:
QUESTION: 18

Find the angle whose measure is five times its complement

Solution:
QUESTION: 19

Find x if I║m.

Solution:
QUESTION: 20

Find the value of x if I║m.

Solution:

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