8th grade math chart.

8th grade math chart.,!Maria Torres2nd periodMrs. Rhine

Perimeter.,!Distance around a two-dimensional shape.Square p=4sRectangle p=2L+2W or p=2(L+W)An easier way to find the perimeter is add up all the sides.

Circumference.,!The distance around the edge of a circle(or any curvy shape)C=2*3.14*r

Area.,!The size of a surface.The amount of space inside a boundary of a flat(2-demensional) object such as triangle or circle.A=s2(square)A=lw or A=Bh(rectangular)A=1/2(b1+b2)h or A=Bh/2(triangle) A=(b1+b2)h/2(trapezoid)A=pi*r2(circle)

Surface area.,!You can find the surface area in the total way or the lateral way and the equations are....Prism(total) s=ph+2B (lateral)S=PhAnd so on.

Surface areaCube(total) S=6s2Prism(lateral) S=Ph (total)S=PhPyramid(lateral)s=1/2Pl (total)S=1/2Pl+BCylinder(lateral)S= 2 rh (total)S=2 r(h+r)

volumePrism v=BhCylinder V=BhPyramid V=1/3 BhCone V=1/3BhSphere V=4/3 r3.

Volume.,!The amount of 3-dimensional space an object occupies by an object, Capacity.

Pi.,! =3.14 or = 22/7 Pi means that you use it when it indicates you to use it. Like when you use it to find formulas for a circle .

3 dimensional shapes,.!Shapes that have a lot of sides and that you can measure every side.

2 dimensional shape.,!Shape that is flat you can only see the front and can only measure the front.

Ratios.,!Numbers that are like fractions cause there divided in two with a symbol in the middle dividing the numbers. Ex: 5/4 ratio

PEMDAS.,!Steps to a equation from the beginning so you can get it right.

Big P.,!The big P represents the perimeter of the base of a 3-dimensional figure.

Big B.,!Big B represents the area of the base of a 3-dimentional shape.

Pythagorean theoremYou find Pythagorean theorem by using this equation a2+b2=c2The definition of this is to modified to apply outside its original domain. simple interest formulaYou find the simple interest formula with this equation I=prt.perimeterWord problemSquare There's a box that they want to measure the perimeter the side lengths are 7ft. find the perimeter? answer: 28ft RectangleThis rectangle measures 5in of whith and 7in of length they want to find the perimeter. What is the perimeter?Answer: 39in circumferenceWord problemArea Word problemword problem.,! if Valeria is going to pack Styrofoam in a rectangular prism and the length is 20,the width is 10,and the height is 15.what is the volume?A. 3000B.2050C.100D. not In the choices above.

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