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Mathematics for IGCSE & O level - Angles (Section 4)

1
What do you call angles that add up to 180 degrees?
Answer
(B)
Supplementary angles
2
In a triangle, two angles are 50° and 80°. What is the measure of the third angle?
Answer
(B)
50°
3
If a quadrilateral has angles of 70°, 110°, and 90°, what is the value of the fourth angle?
Answer
(B)
90°
4
In a polygon, how are the exterior and interior angles related at any vertex?
Answer
(C)
They are supplementary.
5
In a quadrilateral, if three angles are 80°, 100°, and 60°, what is the measure of the fourth angle?
Answer
(B)
110°
6
If two lines are perpendicular, what is the angle between them?
Answer
(C)
90°
7
In a parallelogram, which of the following are true?
Answer
A
C
D
8
Which of the following terms describes a line that intersects two or more other lines at distinct points?
Answer
(C)
Transversal line
9
If an angle measures 45 degrees, what is the measure of its complement?
Answer
(A)
45°