IBA Mathematics MCQs

Alternate interior angles formed by parallel lines are equal.
Thus, the matching angle is 65°.

Complementary angles sum to 90°.
Thus, 90° - 38° = 52°.

Supplementary angles sum to 180°.
Thus, 180° - 125° = 55°.

Vertically opposite angles are equal.
Therefore, the opposite angle is 72°.

For a triangle, the sum of any two sides must exceed the third.
Here 4 + 7 = 11, which is less than 12.

An angle subtended by a diameter at the circumference is a right angle.
This result is known as Thales' theorem.

The diameter is twice the radius.
Thus, 2 × 7 = 14 cm.

One complete revolution corresponds to 360 degrees.
Therefore, the central angle of a full circle is 360°.

A tangent to a circle is perpendicular to the radius drawn to the contact point.
The angle between them is 90°.

Corresponding angles between parallel lines are equal.
Therefore, the other angle is also 110°.

Under the common school definition, a trapezium has one pair of parallel sides.
Parallelograms have two pairs.

The sum is (n - 2) × 180°.
For n = 5, this is 3 × 180° = 540°.