GRADE 8 MATH CHARTBy:) LUIS SALAZAR(:

VOLUME The amount of an object that takes up

space. Prism V=Bh Cylinder V=Bh Pyramid V=1

3 Bh Cone V=1

3 Bh Sphere V=4

3 3.14r2

Question?

What is the volume of a rectangle prism if the height = 5cm and the with = 10cm?

Answer=250

cm

circumference The area within a bounding line: the

vast circumference of his mind. Circle

C=2*pi*r

Question?

What is the circumference of the circle if the diameter 5cm?

Answer=15.7

PerimeterThe perimeter is the border or outer

boundary of a two-dimensional figure.

Square R=4sRectangle P=2l+2w or P=(l+w)

Square P=4s

Big question?

What is the perimeter of a square if all of the sides equal 7cm?

Answer=28cm

Pi  A transcendental number,

fundamental to mathematics, that is the ratio of the circumference of a circle to its diameter. Approximate value: 3.141 5927…; symbol: ∏

∏ ∏=3.14

Word problem?

What is the area of the circle if the radius = 7

Answer=

Pythagorean theorem

The theorem that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.

Pythagorean theorem a2 +b2 =c2

Simple interest formula

Simple interest formula I=prt

Area any particular extent of space or

surface; part: the dark areas in the painting; the dusty area of the room.

Square A=s Rectangle A=lxw or A=bh Triangle A=1

2

Trapezoid A=12

Circle A=3.14xrx2

Question?

What is the area of the square? 10cm

6cm

Answer=16

Big P

P represents the perimeter of the base of all three-dimensional figure.

Big B

B represents the area of the base of a three-dimensional figure.

Question?

What is the volume of the cylinder if the area = 112?

Answer=175.84

Area of the base

Base area is length times width B represents the area of the base of

a three-dimensional figure.

Surface area Surface area is the measure of how

much exposed area a solid object has, expressed in square units. Mathematical description of the surface area is considerably more involved than the definition of arc length of a curve.

Cube (total) S=6s2

Prism(lateral) S=Ph Prism(total) S=Ph+2B Pyramid(lateral) S=1

2Pl Pyramid(total) S=1

2Pl=B Cylinder(lateral) S=23.14rh Cylinder(total) S=23.14rh=23.14r2

Function notation

A notation that describes a function

Ratios

A "ratio" is just a comparison between two different things. ... Given a pair of numbers, you should be able to write down the ratios.

P.E.M.D.A.S.

Parenthesis() Exponents

Multiply (x)DivideAdd (+)Subtract(-)

(÷)