To find the volume of a pyramid ;

V= (1/3)B*H

Volume of a cone ;

V=(1/3) πr²h OR V= (1/3)BH

# math blog

## Sunday, April 22, 2012

### How do you find the Surface Area and Volume of a sphere?

To find the Surface Area of a sphere you would have to use this formula ;

To find the Volume of Sphere you would use this formula ;

To find the Volume of Sphere you would use this formula ;

__Find the surface area and area ;__## Tuesday, April 10, 2012

### how do we calculate Surface Area of a Cylinder?

•To find the Surface Area of a cylinder you would use the formula

S.A.= L.A. + 2B

•To find Lateral Area ( L.A.) you would use the formula

L.A.= 2πrh

•One you get the lateral area you plug that number into the SA formula. The next step, you would have to find the area base of the base to plug it into the SA formula.

Area of base= πr

S.A.= L.A. + 2B

•To find Lateral Area ( L.A.) you would use the formula

L.A.= 2πrh

•One you get the lateral area you plug that number into the SA formula. The next step, you would have to find the area base of the base to plug it into the SA formula.

Area of base= πr

^{2 }### How do we identify Solids?

__Solid Geometry__

- Is the 3- dimensional space.

- There is 3 dimensions, width, depth, and height.

__Solids of Properties__

- Volume

- Surface Area (SA)

__Types of Solids__

- Polyhedra

- Non - Polyhedra

- Polyhedra: must have flat faces. Some shapes that are considered polyhedra are prisms, pyramids, and platonic solids.

- Non - Polyhedra: Only surfaces that are not flat. Shapes that are non-polyhedra are spheres, cylinders, cone, and torus.

## Sunday, March 25, 2012

### How do we find the area of a circle?

^{}

To find the area of a circle you would use the formula :

A =πr

^{2 }

^{}

^{ A is the area r is the radius of the circle WIth the given information you plug in the number(s) to the formula. }

^{ }

### How do we find the area of regular polygons?

To calculate the area of a regular polygon you would use the formula :

A = ½ * nas OR A= ½ * Pa

A is the area

P is the perimeter

a is the apothem

s is the length of each side

n is the number of sides

A = ½ * nas OR A= ½ * Pa

A is the area

P is the perimeter

a is the apothem

s is the length of each side

n is the number of sides

## Thursday, March 22, 2012

### how do we find the area of parallelograms, kites, and trapezoids?

When solving the area to a figure like parallelograms, kites,and trapezoids, each one of those shapes has their own formula.

__Area of a Parallelogram:____Area of a Kite:____Area of a Trapezoid:__

Example #1

Parallelogram Area = B x H

Area = 12 x 5

Area = 60 cm ²

Example #2

Kite Area = ½ d

_{1}d_{2}_{ }Area= ½ ( 8 x 6)

Area= ½ (48)

Area = 24 cm ²

Example #3

Trapezoid Area = ½ h( b

_{1 +}b_{2})_{}Area = ½ 5(10 + 14)

Area = ½ (120)

Area = 60in²

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