perimeter - Master This Word
Master this word with our 5-step learning method – Learn English in English
perimeter Word Meanings
- the boundary of a geometric figure
- the total distance around a shape
- an outer limit or boundary
perimeter Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
perimeter Phonetic & Pronunciation
UK
/pəˈrɪ.mɪ.tə/
US
/pəˈrɪ.mɪ.tɚ/
perimeter Word Etymology
peri- = around + meter = measure. From Greek ‘perimeteros’ meaning ‘radius’ or ‘circumference’. Picture measuring around a garden to know how much fence you need.
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
Perimeter is the distance around the outside of a shape. For polygons you add the lengths of all sides to get the perimeter. The term also appears in everyday language to mean a boundary or limit. In math, learners often confuse perimeter with area, which measures the space a figure covers. Perimeter is measured in units such as meters or feet. When designing a garden or fence, the perimeter helps estimate how much material is needed. For circles, the formula is 2πr; for rectangles, 2(l + w). Understanding perimeter builds a foundation for more advanced geometry and real‑world measurement tasks.
Usage Reminders
- Perimeter is the sum of all outside edges
- Units must be consistent (meters with meters, feet with feet)
- For circles use 2πr and for rectangles use 2(l + w)
- Perimeter is about boundary length, not area
- Practice by drawing shapes and labeling each side
Common Misconceptions
- Perimeter equals area
- Perimeter is the same as the diameter for circles
- Perimeter is the inside length of the shape
- You can estimate perimeter from area alone
- Perimeter does not depend on units
Thinking Differences
For English learners, perimeter is primarily seen as a boundary length and is distinct from area; confusion often comes from the word 'boundary' being used in daily life. Emphasize that perimeter is the sum of edge lengths, not the inside space.
Learning Tips
- Draw every shape you study and label each side
- memorize formulas for circle and rectangle
- Compare perimeter with area using the same figure
- Practice with real objects (tables, rooms, fences)
- Check units and convert if needed
- Use a ruler or measuring tape for hands-on learning
5-Step Learning Method - Learn English in English
Step 1: Meaning
What is the meaning of 'perimeter'?
A.A shape
B.An entrance
C.A boundary
D.A river
Step 2: Usage
In which sentence is 'perimeter' used correctly?
A.The cat sat on the perimeter.
B.She enjoyed walking along the perimeter.
C.He swam across the perimeter.
D.I climbed the perimeter.
Step 3: Similar Words
Which word is a synonym of 'perimeter'?
A.Interior
B.Center
C.Boundary
D.Surface
Step 4: Opposite Words
What is the opposite meaning of 'perimeter'?
A.Edge
B.Center
C.Outside
D.Inside
Step 5: Mastery
In what real-life situation would you consider the perimeter of a space?
A.Growing vegetables indoors
B.Building a fence around a garden
C.Watching a movie
D.Playing a video game
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