equilateral - Master This Word
Master this word with our 5-step learning method – Learn English in English
equilateral Word Meanings
- having all sides equal in length
- relating to a shape with equal angles
- a term often used in geometry
equilateral Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
equilateral Phonetic & Pronunciation
UK
/ˌiːkwɪˈlæt.ər.əl/
US
/ˌiːkwɪˈlæt̬.ɚ.əl/
equilateral Word Etymology
Root decomposition: equi- (equal) + lateral (side); Historical origin: Latin 'aequilateralem' → Old French → English; Memory image: Picture a perfectly balanced triangle, like a beautifully symmetrical slice of cake where each piece is the same size, representing equality and harmony.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputReal Context
Equilateral describes shapes with equal side lengths and, in the triangle case, equal angles. In geometry, an equilateral triangle has all three sides the same length and each interior angle measuring 60 degrees. The term also appears in broader, metaphorical use to signal balance, symmetry, or uniformity in a design or arrangement. When teaching, it's helpful to contrast equilateral with isosceles (two equal sides) and scalene (no equal sides). Remember that regular polygons are often equated with equilateral shapes, though regularity also implies equal angles in many cases. The emphasis is on equality of sides, with angles following in triangles.
Usage Reminders
- Use equilateral to describe shapes with all sides equal.
- It is most common with triangles, especially the equilateral triangle.
- Do not confuse with isosceles (two equal sides) or scalene (no equal sides).
- Apply the term when discussing symmetry and regular polygons.
- Metaphorically, it can suggest balance or uniformity in design.
Common Misconceptions
- Equal sides do not guarantee equal angles in polygons with more than three sides.
- Equilateral describes side lengths; not every shape with equal sides is a regular polygon.
- A square is a regular quadrilateral; language often leans toward saying 'equilateral triangle' rather than 'equilateral shape' for non-triangles.
- Some learners think all equilateral shapes must be flat or in a single plane, which is not a geometry rule.
- Metaphorical use can differ; avoid applying equilateral ideas to unrelated contexts.
Thinking Differences
Think of equilateral as a strict geometric property: equality of sides, often followed by equal angles in triangles. Learners should avoid assuming equal sides force equal angles in non-triangles and beware metaphorical uses.
Learning Tips
- Draw diagrams of equilateral shapes and compare with isosceles and scalene.
- Practice identifying equilateral triangles in pictures.
- Use mnemonics: 'equi' means equal, 'lateral' means side.
- Explain the concept aloud to reinforce memory.
- Create flashcards contrasting side equality vs angle equality.
- Apply the term in simple real-life examples like balanced designs.
5-Step Learning Method - Learn English in English
Step 1: Meaning
What is the definition of 'equilateral'?
A.Having one side longer than others
B.Having all sides equal in length
C.Having a curved shape
D.Having no defined sides
Step 2: Usage
Which sentence uses 'equilateral' correctly?
A.The equilateral dog ran very fast.
B.The equilateral triangle has three equal sides.
C.She painted an equilateral circle.
D.The equilateral book was on the shelf.
Step 3: Similar Words
Which word is most similar to 'equilateral'?
A.Isosceles
B.Symmetrical
C.Unequal
D.Curved
Step 4: Opposite Words
What is the opposite of 'equilateral'?
A.Regular
B.Asymmetrical
C.Equal
D.Balanced
Step 5: Mastery
Can you think of a real-life context where 'equilateral' applies?
A.When discussing geometry in school, an equilateral triangle is often mentioned.
B.In some countries, transportation is a major concern.
C.Different animals have varying lifespans.
D.The weather changes frequently in different regions.
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