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# 8 th grade math chart.,! - PowerPoint PPT Presentation

Maria Torres 2 nd period Mrs. Rhine. 8 th grade math chart.,!. Perimeter.,!. Distance around a two-dimensional shape. Square p=4s Rectangle p=2L+2W or p=2(L+W) An easier way to find the perimeter is add up all the sides. Circumference.,!.

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Presentation Transcript
Maria Torres

2nd period

Mrs. Rhine

Perimeter.,!
• Distance around a two-dimensional shape.
• Square p=4s
• Rectangle 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=Ph
• And so on.
Surface area
• Cube(total) S=6s2
• Prism(lateral) S=Ph (total)S=Ph
• Pyramid(lateral)s=1/2Pl (total)S=1/2Pl+B
• Cylinder(lateral)S= 2 rh (total)S=2 r(h+r)
volume
• Prism v=Bh
• Cylinder V=Bh
• Pyramid V=1/3 Bh
• Cone V=1/3Bh
• Sphere 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 theorem
• You find Pythagorean theorem by using this equation a2+b2=c2
• The definition of this is to modified to apply outside its original domain.
simple interest formula
• You find the simple interest formula with this equation I=prt.
Word problemperimeter
• Square

There's a box that they want to measure the perimeter the side lengths are 7ft. find the perimeter?