7/30/2019 Definitions Geometry ElementaryTxtbks

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Elementary School Textbook Definitions

Shape Everyday Math Expressions Scott Foresman

Triangle A polygon with three

sides.

equilateral isoscelestriangle triangle

scalene right

triangle triangle

K & 1st A closed

figure with three

sides.

2nd, 4th, & 5th Apolygon with three

sides.

3rd No definition.

K, 1st, & 2nd

No definition.

3rd, 4th, & 5th A

polygon with 3 sides.

Polygon A 2-dimensional

figure that is made

up of three or more

line segments joinedend to end to make

one closed path. The

line segments of a

polygon may not

cross.

K & 1st No definition.

2nd A closed plane

(two-dimensional)

figure made up ofthree or more line

segments.

3rd A closed plane

figure made up of line

segments.

4th A closed plane

figure with straight

line segments foreach of its sides.

5th A closed plane

figure with sides that

are straight line

segments.

K, 1st, & 2nd

No definition.

3rd A closed figure

made up of straightline segments.

4th & 5th A closed

plane figure made up

of line segments

Quadrilateral A polygon that has

four sides. Same as

quadrangle.

Quadrangle Apolygon that has four

angles.

K & 1st No definition.

2nd A closed figure

with four sides.

3

rd

A figure with foursides.

4th & 5th A polygon

with four sides.

K, 1st, & 2nd

No definition.

5th A polygon with 4

sides.

7/30/2019 Definitions Geometry ElementaryTxtbks

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Elementary School Textbook Definitions

Shape Everyday Math Expressions Scott Foresman

Square A rectangle whose

sides are all the same

length.

K, 1st, 2nd, & 4th

A figure with four

right angles and four

congruent sides.3rd A rectangle with

four sides of the

same length.

5th A rectangle with

four congruent sides.

K, 1st, & 2nd

No definition.

3rd A quadrilateral

with four right anglesand all sides the same

length.

5th A rectangle with

all sides the same

length.

Rectangle A parallelogram with

four right angles.

K, 1st, 2nd, 3rd, 4th, & 5th

A parallelogram with

four right angles.

K, 1st, & 2nd

No definition.

3rd

& 4th

A quadrilateral with

four right angles.

5th A parallelogram

with four right

angles.

Kite A quadrilateral with

two pairs of adjacent

equal sides. The four

sides cannot all havethe same length, so a

rhombus is not a kite.

No definition

available.

No definition

available.

Trapezoid A quadrilateral that

has exactly one pair

of parallel sides.

K & 1st A quadrilateral

with at least one pair

of parallel sides.

2nd & 4th

No definition.

5th A quadrilateral

with one pair of

parallel sides.

K, 1st, & 2nd

No definition.

3rd & 4th

A quadrilateral with

only one pair of

parallel sides.

5th A quadrilateral

that has exactly one

pair of parallel sides.

7/30/2019 Definitions Geometry ElementaryTxtbks

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Elementary School Textbook Definitions

Shape Everyday Math Expressions Scott Foresman

Parallelogram A quadrilateral with

two pairs of parallel

sides. Opposite sides

of a parallelogram arecongruent. Opposite

angles in a

parallelogram have

the same measure.

K, 1st, & 2nd

A quadrilateral in

which both pairs of

opposite sides areparallel and opposite

angles are congruent.

3rd, 4th, & 5th A

quadrilateral with

both pairs of opposite

sides parallel.

K, 1st, & 2nd

No definition.

3rd & 4th A

quadrilateral in whichopposite sides are

parallel.

5th A quadrilateral

with both pairs of

opposite sides

parallel.

Rhombus A quadrilateral whosesides are all the same

length. All rhombuses

are parallelograms.

Every square is a

rhombus, but not all

rhombuses are

squares.

K, 1st

, & 2nd

No definition.

3rd,4th, & 5th A

parallelogram with

congruent sides.

K. 1st

, & 2nd

No definition.

3rd A quadrilateral

with opposites sides

parallel and all sides

the same length.

4th A quadrilateral in

which opposite sides

are parallel and all

sides are the samelength.

5th A parallelogram

with all sides the

same length.