Questions & Answers
Browse all 25 questions from the
Trigonometry Fundamentals study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
In a right-angled triangle, what is the name of the side located opposite the right angle?
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A
Adjacent
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B
Hypotenuse
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C
Base
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D
Height
2
The study of trigonometry is primarily based on the properties of which geometric shape?
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A
Circle
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B
Square
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C
Triangle
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D
Rectangle
3
If one angle of a right-angled triangle is 90 degrees, what is the sum of the other two angles?
-
A
45 degrees
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B
90 degrees
-
C
180 degrees
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D
60 degrees
4
In a right-angled triangle, the sine of an angle is defined as the ratio of the length of the opposite side to the length of which other side?
-
A
Adjacent side
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B
Hypotenuse
-
C
Base
-
D
Vertex
5
Which term describes a triangle where all three sides have different lengths?
-
A
Equilateral
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B
Isosceles
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C
Scalene
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D
Right-angled
6
What is the total sum of the interior angles of any triangle?
-
A
90 degrees
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B
180 degrees
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C
270 degrees
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D
360 degrees
7
Which ratio represents the tangent of an angle in a right-angled triangle?
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A
Opposite / Adjacent
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B
Adjacent / Hypotenuse
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C
Opposite / Hypotenuse
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D
Hypotenuse / Opposite
8
A triangle that has two sides of equal length is known as what?
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A
Equilateral
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B
Scalene
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C
Isosceles
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D
Obtuse
9
What is the name of an angle that measures exactly 90 degrees?
-
A
Acute angle
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B
Obtuse angle
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C
Right angle
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D
Reflex angle
10
Which trigonometric function is defined as the ratio of the adjacent side to the hypotenuse?
-
A
Sine
-
B
Cosine
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C
Tangent
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D
Secant
11
An angle that measures less than 90 degrees is classified as what?
-
A
Acute
-
B
Obtuse
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C
Right
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D
Straight
12
What is a triangle called if all three of its angles are less than 90 degrees?
-
A
Right triangle
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B
Obtuse triangle
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C
Acute triangle
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D
Straight triangle
13
If a triangle has an angle greater than 90 degrees, it is classified as what?
-
A
Acute
-
B
Obtuse
-
C
Right
-
D
Equilateral
14
In a right triangle, the side next to a specific angle (that is not the hypotenuse) is called what?
-
A
Opposite
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B
Adjacent
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C
Hypotenuse
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D
Diagonal
15
Which instrument is commonly used to measure angles in geometry?
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A
Compass
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B
Protractor
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C
Ruler
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D
Scale
16
What is the value of the longest side in a right-angled triangle?
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A
Opposite
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B
Adjacent
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C
Hypotenuse
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D
Base
17
A triangle with three equal sides and three equal angles is called what?
-
A
Scalene
-
B
Isosceles
-
C
Equilateral
-
D
Right
18
If a triangle is 'equilateral', what is the measurement of each of its interior angles?
-
A
45 degrees
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B
60 degrees
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C
90 degrees
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D
30 degrees
19
Which mathematician is often associated with the theorem relating the sides of a right-angled triangle?
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A
Pythagoras
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B
Einstein
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C
Newton
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D
Euclid
20
What is the name for a triangle that has one 90-degree angle?
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A
Acute triangle
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B
Obtuse triangle
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C
Right triangle
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D
Scalene triangle
21
In trigonometry, what does the 'hypotenuse' refer to?
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A
The shortest side
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B
The longest side
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C
An angle
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D
A vertex
22
The Greek letter 'theta' (θ) is commonly used in trigonometry to represent what?
-
A
Side length
-
B
Angle
-
C
Area
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D
Perimeter
23
How many sides does a triangle have?
24
An angle of exactly 180 degrees is known as what type of angle?
-
A
Right
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B
Acute
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C
Straight
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D
Reflex
25
Which geometric ratio relates the 'opposite' side to the 'hypotenuse' in a right triangle?
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A
Sine
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B
Cosine
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C
Tangent
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D
Cotangent
