Geometry

diamond

noun

/daɪ.mənd/ or /dai.mēnd/

d

d

ia

aɪ

m

m

o

ə

n

n

d

d

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a shape with four equal, sloping straight sides, forming a point at the top and another at the bottom

angle

noun

/æn.gəl/ or /ān.gēl/

a

æ

n

n

g

g

ə

l

l

e

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the space between two lines or surfaces that are joined, measured in degrees or radians

line

noun

/laɪn/ or /lain/

l

l

i

aɪ

n

n

e

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a row of people or things behind each other or next to each other

point

noun

/pɔɪnt/ or /pawint/

p

p

oi

ɔɪ

n

n

t

t

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(geometry) an element that only has position, with no size or dimension

pyramid

noun

/pɪ.rə.mɪd/ or /pi.rē.mid/

p

p

y

ɪ

r

r

a

ə

m

m

i

ɪ

d

d

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a solid object with a square base and four triangular sides joined to a point on the top

circle

noun

/sɜrk.lə/ or /sērk.lē/

c

s

i

ɜ

r

r

c

k

l

l

ə

e

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a completely round, plain shape

square

noun

/skwɛr/ or /skver/

s

s

q

k

u

w

a

ɛ

r

r

e

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a shape with four equal straight sides and four right angles, each measuring 90°

arch

noun

/ɑrʧ/ or /aarch/

a

ɑ

r

r

ch

ʧ

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anything with a curved top and parallel sides

semicircle

noun

/sɛ.mi.sɜrk.lə/ or /se.mi.sērk.lē/

s

s

e

ɛ

m

m

i

i

c

s

i

ɜ:

r

r

c

k

ə

l

l

e

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any half of a circle

spiral

noun

/spaɪ.rəl/ or /spai.rēl/

s

s

p

p

i

aɪ

r

r

a

ə

l

l

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(geometry) a curved shape or design that gradually winds around a center or axis

curve

noun

/kɜrv/ or /kērv/

c

k

u

ɜ

r

r

v

v

e

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a line or shape that is not straight and bends gradually

hemisphere

noun

/hɛ.mɪs.fɪr/ or /he.mis.fir/

h

h

e

ɛ

m

m

i

ɪ

s

s

ph

f

e

ɪ

r

r

e

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one of the two halves of the Earth, separated by the equator or a meridian

rectangle

noun

/rɛk.tæn.gəl/ or /rek.tān.gēl/

r

r

e

ɛ

c

k

t

t

a

æ

n

n

g

g

ə

l

l

e

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(geometry) a flat shape with four right angles, especially one with opposing sides that are equal and parallel to each other

triangle

noun

/traɪ.æn.gəl/ or /trai.ān.gēl/

t

t

r

r

ia

aɪæ

n

n

g

g

ə

l

l

e

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(geometry) a flat shape consisting of three straight sides and three angles

right angle

noun

/ɹˈaɪt ˈæŋɡəl/

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an angle measuring exactly 90 degrees