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Introduction to Trigonometry

Mathematics

Fundamental concepts of right-angled triangle relationships and trigonometric ratios.

geometry trigonometry triangles

8 Questions Easy Ages 12+ Sep 13, 2026

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About this Study Set

This study set covers Mathematics through 8 practice questions. Fundamental concepts of right-angled triangle relationships and trigonometric ratios. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 8 questions from the Introduction to Trigonometry study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 In a right-angled triangle, which trigonometric ratio is defined as the opposite side divided by the hypotenuse?

A Sine
B Cosine
C Tangent
D Secant

2 Which acronym is commonly used to remember the three primary trigonometric ratios?

A PEMDAS
B SOHCAHTOA
C BODMAS
D FOIL

3 In a right-angled triangle, the side opposite the 90-degree angle is known as the:

A Adjacent
B Opposite
C Hypotenuse
D Base

4 If the tangent of an angle is 1, what is the measure of the angle in a right triangle?

A 30 degrees
B 45 degrees
C 60 degrees
D 90 degrees

5 What is the value of the sine of 90 degrees?

A 0
B 0.5
C 1
D Undefined

6 In the ratio 'Cosine', which two sides of a right-angled triangle are compared?

A Opposite and Hypotenuse
B Adjacent and Hypotenuse
C Opposite and Adjacent
D Hypotenuse and Adjacent

7 The study of trigonometry is historically rooted in the relationship between:

A Angles and side lengths
B Volume and density
C Speed and time
D Area and perimeter

8 In a right triangle where one angle is 30 degrees and another is 90 degrees, what is the measure of the third angle?

A 30 degrees
B 45 degrees
C 60 degrees
D 90 degrees

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