Algebraic 8th Math Vocabulary

By : Noah Sichanthavong

PerimeterThe border or outer boundary of a two dimensional shape.

Square- 4sRectangle- 2l+2w

Word ProblemIf I want to have fencing around my backyard

and my backyard has a length of 40 feet and a length of 30 feet what is the area of my backyard?

1200 sqft2

Lx2+Wx2

Word ProblemA square fence has a length of 8 feet. What is

the perimeter of the fence?

32

8

84

CircumferenceThe outer boundary of a circle or

circle-like figure.

Circle- 2πr

Word ProblemThere’s a circle with a radius of 1.6 feet. What

is it’s circumference?

1.6 10 ft

2πr

AreaThe area is the surface of an object

measured in square units.Square- s2

Rectangle- LWTriangle- 1/2BHTrapezoid- ½(b1+b2)hCircle- πr2

Word ProblemA triangle has a base of 12 in and a

height of 6 what is its area?

1/2BH

36 in2

Word problemJohn has a picture of his football team. It is

measured 6x8 inches. What is the area of the picture? 8

6

48 Inches

LxW

Surface AreaThe extent of a 2D surface enclosed in

a boundary.Cube- 6s2

Prism- PHPyramid- 1/2PL

Cylinder- 2πrh

Word ProblemOne day Gage was being a retard and wanted

to know the surface area of his Rubix Cube. If one side has an area of 4 inches, what is the total surface area of the cube?

96 Sq in2

6s2

VolumeThe amount of space measured in cubic

units.

Prism- BhCylinder- BhPyramid- 1/3 Bh

Cone- 1/3 Bh

Sphere- 4/3πr3

Word problemA makeshift pyramid Joe made has a

base of 5 inches and a height of 6 inches. What is the pyramid’s volume?

9.9 fl.oz

Word ProblemJohn bought a cup to measure fluids with but

he doesn’t know the volume of the cup. If the height is 6 inches and the width 4 inches. What is the volume of the cup?

6 inches

4 Inches

24 fl.oz.

BxH

PiThe letter N used as the symbol for

the ratio of a circumference of a circle of its diameter.

π-3.14

Word ProblemJosh wanted to know the area of the circle he

had just cut out. The circle measures 2in. in radius. What is y, the circle’s area?

2 x 2 x 3.14 = y12.56 in2

πr2

Pythagorean TheoremThe theorem that the square of the

hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.

A2+B2=C2

Simple Interest FormulaInterest payable only on the principal.

I=prt

Word ProblemIf Ryan puts 200 dollars in the bank for 3 years

and his rate is 8%. What is his interest?

48 dollars

I = prt

Linear EquationsAny equation such that the sum of two

solutions is a solution, and a constant multiple of a solution is a solution.

2x + 4y = 2(x + 2y)

FunctionA set of ordered pairs in which none of

the first elements of the pairs appears twice.

(2.5, 3) (2.3, 3)

Word ProblemDomain: {10, 5, 0, -5, -10}Range: {1, 2, 3, 4, 5}Is this a function?

Yes

SquareA Rectangle having all 4 sides the

same length

4

4

RectangleA parallelogram having four right

angles

TriangleA closed plane having three sides and

three angles

TrapezoidA quadrilateral plane figure having

two parallel and two nonparallel sides

CircleA closed plane curve consisting of all

points at a given distance from a point within it called the center

CubeSolid bounded by six equal squares,

the angle between any two adjacent faces being a right angle

PrismA solid having bases or ends that are

parallel congruent polygons and sides that are parallelograms

PyramidA solid having a polygonal base, and

triangular sides that meet at a point

CylinderGeometry . a surface or solid bounded by

two parallel planes and generated by a straight line moving parallel to the given planes and tracing a curve bounded by the planes and lying in a plane perpendicular or oblique to the given planes