Josephine's scribe post

How to find...
- Circumference of a circle
- Area of a circle
- Surface area of a cylinder
- Volume of a cylinder
Formulas:
Circumference of a circle - pi d (pi *d) OR pi 2 r (pi * 2 * r)
Area of a circle - pi r² (pi * r²)
Surface area of a cylinder -
area of circle = (pi * r²) * 2
+
area of square = H * C
=
surface area of a cylinder
Circumference = pi r 2 (pi * 2 * r) (also needed to find surface area of a cylinder)
Volume of a cylinder - area of the base * height

Voicethread of Yellow Paper:
coming soon...:)

Rectangular Prism Test Scribe Q.1

find the surface area and volume of...

VOL= area of base x height

BASE: lxw=

4x4=

16

HEIGHT= 4

16 x 4 = 64 cm3

SA= 2(hxl)+2(wxh)+2(lxw)=

SA= 2(16)+2(16)+2(16)=

SA= 32+32+32=

SA=96cm2

Karen's B.O.B

For Finding the Surface Area you just follow the fomula! 2(HxL) + 2(HxW) + 2(LxW)

Fomula:




Net of a Rectangular Prism:
Once you know the formula you can start filling in what you know.




















Finding the Volume of a Rectangular is too. You just have to follow the fomula.

Formula:


Now we can answer the fomula! By filling in the information we know!

gails bob

BOB - blogging on blog

AREA:




















Volume:

Israelie's BOB

Surface Area of a Rectangular Prism





---H=2 W=2 L=4---


SA=2(HxL)+2(HxW)+2(LxW)

=2(2x2)+2(2x2)+2(4x2)

=2(4)+2(4)+2(8)

= 8+8+16

= 32 cm²


















Volume of a Rectangular Prism



---L=5 H=2 W=2---


V= LxHxW
= 5cm x 2cm x 2cm
= 20cm³

OR

area of the base x height
=10cm x 2cm
= 20cm³



:)

Kathleens B.O.B

Surface area of a rectangle prism:
















A way to solve this problem:

L= 12
W= 4
H=12

Formula:
surface area(sa) = 2(hxl) + 2(hxw) + 2(lxw)
sa= 2(12x12) + 2(12x4) + 2(12x4)
sa= 2(144) + 2(48) + 2(48)
sa= 288 + 96 + 96
sa= 480 cm sqaured

-----------------------------------------------------------------------------------------------

Volume of a rectangular prism:














Formula:

Erick's BOB

First Up Surface Area.!

Now the Area of a rectangular Prism is the area of all of the sides of the shape added up.


This is the net. This gives you a very good visual aid in helping you find the surface area of the shape because it shows all of the sides and squares.
Also it just looks neater.

How to find the Surface Area.

Ok. so, shown on this net we have each side measuring 5cm. Now i did some work that is not shown here, but all i did was get the area of the box by using the formula, LxW. So 5x5 would give me the area of one square.

Now all we need to do is use a simple formula to find the surface Area.






Here's the formula for that!

Surface Area= 2(hxl)+2(hxw)+2(lxw)
Surface Area=2(5x5)+2(5x5)+2(5x5)
Surface Area=2(25)+2(25)+2(25)
Surface Area= 50 + 50 + 50
Surface Area = 150cm2

Now its Time for the Volume!!

Now Volume is really simple! All you have to do is Get the measurements of all three sides and multiply them using this formula.
Volume of a Rectangular Prism
LxWxH

5cm2x5cm2x5cm2=125cm3

Please note the cubed!

Another way is Area of base X Height

(25cm2)5cm2=125cm2