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Trigonometry Basics

Trigonometry

A set of fundamental questions about trigonometry, focusing on core definitions and well-known facts.

trigonometry angles ratios geometry

18 Questions Easy Ages 5+ Jul 31, 2026

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About this Study Set

This study set covers Trigonometry through 18 practice questions. A set of fundamental questions about trigonometry, focusing on core definitions and well-known facts. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 18 questions from the Trigonometry Basics 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 ratio of the side opposite an angle to the hypotenuse called?

A Cosine
B Tangent
C Sine
D Cotangent

2 Which trigonometric ratio relates the adjacent side and the hypotenuse of a right-angled triangle?

A Sine
B Tangent
C Cosecant
D Cosine

3 The sum of angles in any triangle is always:

A 90 degrees
B 180 degrees
C 270 degrees
D 360 degrees

4 What is the value of sine of 0 degrees?

A 1
B 0.5
C 0
D -1

5 What is the value of cosine of 90 degrees?

A 1
B 0.5
C 0
D -1

6 In a right-angled triangle, the ratio of the opposite side to the adjacent side is:

A Sine
B Cosine
C Tangent
D Secant

7 Which angle in a right-angled triangle has its sine equal to 1?

A 0 degrees
B 30 degrees
C 45 degrees
D 90 degrees

8 What is the reciprocal of sine?

A Cosine
B Tangent
C Secant
D Cosecant

9 Which trigonometric identity states that sin²(θ) + cos²(θ) = 1?

A Pythagorean Identity
B Double Angle Identity
C Sum-to-Product Identity
D Reciprocal Identity

10 The tangent of 45 degrees is equal to:

A 0
B 0.5
C 1
D √3

11 In a unit circle, an angle of 90 degrees corresponds to the point:

A (1, 0)
B (0, 1)
C (-1, 0)
D (0, -1)

12 Which trigonometric function has a period of 360 degrees (or 2π radians)?

A Tangent
B Cotangent
C Sine
D Secant

13 The cosine of 0 degrees is:

A 0
B 0.5
C 1
D -1

14 What is the ratio of the hypotenuse to the adjacent side called?

A Sine
B Cosine
C Tangent
D Secant

15 The sine of 30 degrees is equal to:

A 0.5
B √2/2
C √3/2
D 1

16 Which trigonometric ratio is the reciprocal of tangent?

A Sine
B Cosine
C Secant
D Cotangent

17 In a right-angled triangle, the hypotenuse is always:

A The shortest side
B The longest side
C Equal to the adjacent side
D Equal to the opposite side

18 What is the value of tangent of 0 degrees?

A 1
B 0.5
C 0
D Undefined

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