Angles & Triangles Quiz

Question 1

What is the sum of angles in a triangle?

Accepted Answer

180°

Answer

90°

Answer

270°

Answer

360°

Question 2

What type of angle is exactly 90°?

Accepted Answer

Right

Answer

Acute

Answer

Obtuse

Answer

Reflex

Question 3

A triangle has angles of 60°, 60°, and 60°. What type is it?

Accepted Answer

Equilateral

Answer

Scalene

Answer

Isosceles

Answer

Right-angled

Question 4

What is a reflex angle?

Accepted Answer

Greater than 180°

Answer

Less than 90°

Answer

Between 90° and 180°

Answer

Exactly 180°

Question 5

In a right-angled triangle, the side opposite the right angle is called?

Accepted Answer

Hypotenuse

Answer

Adjacent

Answer

Opposite

Answer

Base

Question 6

Two angles in a triangle are 70° and 45°. What is the third angle?

Accepted Answer

65°

Answer

55°

Answer

60°

Answer

75°

Question 7

What are angles on a straight line called, and what do they sum to?

Accepted Answer

Supplementary, 180°

Answer

Supplementary, 90°

Answer

Complementary, 90°

Answer

Vertically opposite, 360°

Question 8

A triangle has sides of different lengths. What is it called?

Accepted Answer

Scalene

Answer

Equilateral

Answer

Isosceles

Answer

Acute

Question 9

What do the angles around a point sum to?

Accepted Answer

360°

Answer

90°

Answer

180°

Answer

270°

Question 10

What are vertically opposite angles?

Accepted Answer

Equal angles formed when two lines cross

Answer

Angles that add to 90°

Answer

Angles that add to 180°

Answer

Angles in the same triangle

Question 11

A triangle has two equal sides. What is it called?

Accepted Answer

Isosceles

Answer

Equilateral

Answer

Scalene

Answer

Right-angled

Question 12

What is the Pythagorean theorem?

Accepted Answer

a² + b² = c²

Answer

a + b = c

Answer

a² − b² = c

Answer

2a + 2b = c²

Question 13

A right-angled triangle has legs of 3 and 4. What is the hypotenuse?

Accepted Answer

5

Answer

6

Answer

7

Answer

9

Question 14

What angle is formed by alternate angles when a line crosses two parallel lines?

Accepted Answer

They are equal

Answer

They are supplementary

Answer

They are complementary

Answer

They are right angles

Question 15

What is an obtuse triangle?

Accepted Answer

A triangle with one angle greater than 90°

Answer

A triangle with all angles less than 90°

Answer

A triangle with one right angle

Answer

A triangle with equal sides

Question 16

Co-interior angles (also called same-side interior angles) between parallel lines sum to?

Accepted Answer

180°

Answer

90°

Answer

270°

Answer

360°

Question 17

What is the area of a triangle with base 10 cm and height 6 cm?

Accepted Answer

30 cm²

Answer

16 cm²

Answer

60 cm²

Answer

120 cm²

Question 18

A right-angled triangle has legs of 5 and 12. What is the hypotenuse?

Accepted Answer

13

Answer

14

Answer

15

Answer

17

Question 19

The exterior angle of a triangle equals?

Accepted Answer

The sum of the two non-adjacent interior angles

Answer

The largest interior angle

Answer

180° minus the adjacent angle

Answer

The average of all interior angles

Question 20

What do corresponding angles equal when a transversal crosses parallel lines?

Accepted Answer

They are equal

Answer

They add to 90°

Answer

They add to 180°

Answer

They are supplementary