plane trigonometry: meaning, definition, pronunciation and examples
C2 / Extremely low frequency (specialist term)Formal, academic, technical
Quick answer
What does “plane trigonometry” mean?
The branch of trigonometry dealing with relationships between angles and sides in two-dimensional plane figures, particularly triangles.
Audio
Pronunciation
Definition
Meaning and Definition
The branch of trigonometry dealing with relationships between angles and sides in two-dimensional plane figures, particularly triangles.
The foundational level of trigonometric study, distinct from spherical trigonometry, used to solve problems involving distances, heights, and angles in engineering, surveying, and mathematics. It forms the basis for most practical applications.
Dialectal Variation
British vs American Usage
Differences
No significant semantic or usage differences. Both use the term identically in mathematical contexts.
Connotations
Technical, educational, foundational mathematics.
Frequency
Used exclusively in academic and technical fields in both varieties. Frequency is equally low.
Grammar
How to Use “plane trigonometry” in a Sentence
[study/learn/understand] + plane trigonometrythe + principles/laws + of + plane trigonometryVocabulary
Collocations
Usage
Meaning in Context
Business
Virtually never used.
Academic
Core subject in secondary and tertiary-level mathematics curricula.
Everyday
Extremely rare, used only when referencing mathematical education.
Technical
Used in engineering, surveying, architecture, and physics contexts for calculations involving planar structures.
Vocabulary
Synonyms of “plane trigonometry”
Vocabulary
Antonyms of “plane trigonometry”
Watch out
Common Mistakes When Using “plane trigonometry”
- Omitting 'plane' when specificity is required vs. spherical trigonometry.
- Incorrect spelling: 'plain trigonometry'.
- Treating it as a single word: 'planetrigonometry'.
FAQ
Frequently Asked Questions
In most general contexts, 'trigonometry' implies 'plane trigonometry'. The 'plane' is explicitly added only when contrasting it with 'spherical trigonometry', which deals with triangles on a sphere's surface.
It provides the fundamental tools for calculating lengths and angles in any two-dimensional design or measurement problem, from computer graphics to construction and surveying.
The sine rule and cosine rule are core theorems within plane trigonometry that relate the angles and side lengths of any triangle, not just right-angled ones.
When dealing with measurements on a curved surface, such as in astronomy, global navigation, or geography of the Earth. In those cases, spherical trigonometry is required.
The branch of trigonometry dealing with relationships between angles and sides in two-dimensional plane figures, particularly triangles.
Plane trigonometry is usually formal, academic, technical in register.
Plane trigonometry: in British English it is pronounced /pleɪn ˌtrɪɡəˈnɒmətri/, and in American English it is pronounced /pleɪn ˌtrɪɡəˈnɑːmətri/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “none”
Learning
Memory Aids
Mnemonic
Picture a paper airplane. It flies in a flat, two-dimensional plane. The word 'plane' in 'plane trigonometry' reminds you it's about flat shapes (like triangles drawn on paper), not curved surfaces.
Conceptual Metaphor
Mathematics as a tool for measurement. Plane trigonometry is the toolbox for flat surfaces.
Practice
Quiz
Which of these is a direct application of plane trigonometry?