Online Test — Lines and Angles
10 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 10
medium
Two angles are complementary. If one is 28°, the other is:
62°
152°
28°
62°
Explanation: 90° - 28° = 62°
Question 2 of 10
medium
If two angles form a linear pair and one is 115°, the other is:
65°
75°
115°
245°
Explanation: 180° - 115° = 65°
Question 3 of 10
medium
Vertically opposite angles are always:
Equal
Supplementary
Complementary
Adjacent
Explanation: Vertically opposite angles are equal
Question 4 of 10
medium
When a transversal cuts two parallel lines, corresponding angles are:
Equal
Supplementary
Complementary
Sum to 90°
Explanation: Corresponding angles are equal for parallel lines
Question 5 of 10
medium
If l ∥ m and m ∥ n, then:
l ∥ n
l ⟂ n
l and n intersect
Cannot say
Explanation: Lines parallel to same line are parallel
Question 6 of 10
medium
The sum of angles in a triangle is:
90°
180°
270°
360°
Explanation: Triangle angle sum property = 180°
Question 7 of 10
medium
An exterior angle of a triangle equals:
Sum of all interior angles
Sum of two adjacent interior angles
Sum of two remote interior angles
180° minus adjacent angle
Explanation: Exterior angle = sum of remote interior angles
Question 8 of 10
medium
If two parallel lines are cut by a transversal, consecutive interior angles are:
Equal
Complementary
Supplementary
Zero
Explanation: Consecutive interior angles sum to 180°
Question 9 of 10
medium
Find the angle complementary to 72°:
18°
108°
18°
72°
Explanation: 90° - 72° = 18°
Question 10 of 10
medium
In a triangle, angles are in ratio 1:2:3. The largest angle is:
30°
60°
90°
120°
Explanation: Ratio sum=6, 180°/6=30°, largest=3×30=90°