octagon
/ˈɒktəɡən/noun
उच्चारण ऑक्टगन
अष्टभुज
Core wordPYP · asked 3 times
Asked in previous papers
as one-word substitution
- 1
[C] geometry
a flat shape with eight straight sides and eight angles
अष्टभुज
- The tomb is built in the shape of an octagon.
- A stop sign is an octagon, with eight equal sides, painted bright red.
- Draw an octagon and measure each of its angles.
+ 2 more examples
- The old fort has a tower shaped like an octagon.
- The garden has a fountain at the centre of a stone octagon.
§Structures (grammar patterns) 4
an octagon: article and plural
'Octagon' begins with a vowel sound, so use 'an'. The plural is octagons.
'Octagon' vowel sound से शुरू होता है, इसलिए इसके साथ 'an' आता है; इसका plural 'octagons' है।
- The signboard is an octagon with the word STOP in white.
- The designer drew two octagons on the page.
octagon + shape / in shape
Say 'in the shape of an octagon' or 'octagon-shaped'. The word octagonal is the adjective.
'In the shape of an octagon' या 'octagon-shaped' कहें; विशेषण रूप 'octagonal' है।
- The tower is octagonal in shape.
- The old fort has an octagon-shaped pavilion.
regular / irregular octagon
A regular octagon has eight equal sides and equal angles. Each interior angle is 135 degrees.
Regular octagon की आठों भुजाएँ और आठों कोण समान होते हैं; प्रत्येक आंतरिक कोण 135 डिग्री का होता है।
- A regular octagon has eight lines of symmetry.
count of sides: octa- prefix
The prefix octa- means eight. It appears in octopus, octave and October (the old eighth month).
उपसर्ग 'octa-' का अर्थ आठ है; यह octopus, octave और October (पुराना आठवाँ महीना) में दिखता है।
- An octopus has eight arms, just as an octagon has eight sides.
+Collocations 4
adjective + octagon
regularirregularperfectlargewooden
- The teacher asked us to draw a regular octagon.
verb + octagon
drawformconstructcutmark
- He cut the cardboard to form an octagon.
octagon of + noun
tilesstoneglasslights
- The courtyard floor is an octagon of red stone.
geometry terms with octagon
sideanglevertexdiagonalperimeter
- The perimeter of an octagon with sides of 3 cm is 24 cm.
“More examples 5
- A stop sign in India is usually an octagon painted red.
भारत में stop का चिह्न प्रायः लाल रंग का अष्टभुज होता है।
- The sum of the interior angles of an octagon is 1080 degrees.
अष्टभुज के आंतरिक कोणों का योग 1080 डिग्री होता है।
- Radhika folded the paper again and again until it became an octagon.
राधिका ने काग़ज़ को बार-बार मोड़ा, जब तक वह अष्टभुज नहीं बन गया।
- The monument stands on an octagon of marble steps.
यह स्मारक संगमरमर की सीढ़ियों के एक अष्टभुज पर खड़ा है।
- An octagon has twenty diagonals.
अष्टभुज में बीस विकर्ण होते हैं।
!Common mistakes 3
✗ A octagon has eight sides.
✓ An octagon has eight sides.
Use 'an' before a vowel sound.
Vowel sound से पहले 'an' का प्रयोग होता है।
✗ An octagon is having eight sides.
✓ An octagon has eight sides.
Have is a stative verb here and is not used in the continuous form.
यहाँ 'have' stative verb है और continuous रूप में प्रयुक्त नहीं होता।
✗ The table is of octagon shape.
✓ The table is octagonal in shape.
Use the adjective octagonal, or say in the shape of an octagon.
यहाँ विशेषण 'octagonal' का प्रयोग करें, या 'in the shape of an octagon' कहें।
≠Thesaurus: which synonym when
◇Word family
AaSpelling
oc·ta·gon
⌂Word origin and word building
Oct- means eight: octopus (eight arms), October (once the eighth month), octave.
Oct- का अर्थ आठ है: octopus (आठ भुजाएँ), October (कभी आठवाँ महीना), octave।
✓In the exam
One-word substitution
One-word substitution, asked very often: learn the polygons: triangle (3 sides), quadrilateral (4), pentagon (5), hexagon (6), heptagon (7), octagon (8), nonagon (9), decagon (10).
यह बहुत पूछा जाता है: बहुभुज सीखिए: triangle (3 भुजाएँ), quadrilateral (4), pentagon (5), hexagon (6), heptagon (7), octagon (8), nonagon (9), decagon (10)।
General knowledge
Maths: each interior angle of a regular octagon is 135 degrees.
गणित में नियमित octagon का प्रत्येक आंतरिक कोण 135 डिग्री है।