Sunday, January 21, 2007
We had a good time!!!!
So many things have happened since September.
How many of them will you remember?
Will it ever come up somewhere in your mind
The stories I told of my sister’s Jeopardy time?
Or how about the con-men in the class?
They were trying to see if the answer was SAS.
If you ever feel like giving up and living underground,
At least listen for my metal detector sound.
For it would surely go off if it came near to you
Because you all have hearts of gold, it’s true!
Your life will be filled with many adventures.
Like this time when my aunt flushed away her new dentures!
You never know what is around any bend.
It could be a lawnmower in need of a mend!
If I didn’t send you off with some good advice I would be amiss
So if you will do anything for me it is this,
Do not ever limit yourself to what is easy
For knowing what you will miss will make you queasy
I do not mean to sound like a fortune cookie
Just please trust my experience, I’m no rookie!
So off you go and I hope you go glad
I know I will because this class wasn’t half-bad. ♥
Thursday, January 11, 2007
12.2 Surface Area of Prisms and Cylinders
Surface area of a right prism
Th. 12.2: S=2B+Ph S= Surface area of a right prism
B=Area of ONE of the bases
P= Perimeter of ONE base
H= height
Surface area of a right cylinder
Th. 12.3: S=2B + Ch S= Surface area of a right cylinder
B=Area of ONE of the bases
C= Circumference of ONE base
H= height
12.3 Surface Area of Pyramids and Cones
Surface area of a regular pyramid
Th. 12.4: S=B+ ½ Pl S= Surface area of a regular pyramid
B=Area of the base
P= Perimeter of the base
l= slant height
Surface area of a right cone
Th. 12.5: S= пr2 + пrl S= Surface area of a right cone
r=radius of the base
l= slant height
12.4 Volume of Prisms and Cylinders
Volume of a cube
Postulate 27: V=s3 V= Volume of a cube
s= length of a side
Volume of a Prism
Th. 12.7: V=Bh V= Volume of a prism
B=Area of the base
h= height
Volume of a Cylinder
Th. 12.8: V=Bh V= Volume of a cylinder
B=Area of the base
h= height
12.5 Volume of Pyramids and Cones
Volume of a pyramid
Th. 12.9: V= 1/3 Bh V= Volume of a pyramid
B=Area of the base
h= height
Volume of a cone
Th. 12.10: V= 1/3 Bh V= Volume of a cone
B=Area of the base
h= height
12.6 Surface Area and Volume of Spheres
Surface Area of a sphere
Th. 12.11: S= 4пr2 S= Surface area of a sphere
r=radius
Volume of a sphere
Th. 12.12: V= 4/3 пr3 S= Surface area of a sphere
r=radius
Wednesday, January 10, 2007
notes: 12.1
Polyhedron: solid that is bound by polygons, called faces (think of gold bars) plural: polyhedra or polyhedrons
An edge is where two polygons meet
Vertex- point where 3 or more edges meet
Ex: prism
Pyramid
Other solids: sphere, cone, cylinder
Regular polyhedra have all faces congruent, convex if any 2 points can be connected by a line within the polyhedron
Platonic solids: (named after Plato) (regular polyhedrons)
-tetrahefron (4 faces)
-cube (6 faces)
-octahedron (8)
-dodecahedron(12)
-icosahedron(20)
Euler’s Theorem: The # of faces F, vertices V, and edges E of a polyhegron are related by: F+V=E+2
Pg 723 10-52
Ws 12-1
Monday, January 08, 2007
notes 11-5
Th. 11.7: Area of a Circle= pi*r2
A sector of a circ is the region bound by 2 radii (a slice)
Th 11.8: Area of a sector: The ratio of the area A of a sector of a circ to the area of the circ is = to the ratio of the measure of the intercepted arc to 360.
(A / pi*r2 ) = ( m arc AB/ 360 )
16” pizza cut into 8 = slices, what is the area of 1 slice?
Square with sides of 10 inches with 4 circs inside, find the area of the shaded region
Inscribe a pentagon into a circ, find the m of the shaded region if the length of the radii is 8 ft
Prac ws 1-7
