By failing to prepare, you are preparing to fail.
/Tag: General
11 07, 2018

## Arc Length

Arc Length Go to the Arc Length Forum to see more questions or ask your own Formulas used in Arc Length $L=\frac{\theta}{360}\times 2\pi r$ Worked examples Find the length of the arc in this sector. $L=\frac{50}{360}\times2\times\pi\times 12$ r = 12cm and the angle at the centre = [...]

24 06, 2018

## Standard Forum

By |2018-06-25T11:29:20+10:00June 24th, 2018|Tags: , |Comments Off on Standard Forum

Standard Forum Rules of the Forum be respectful of other members no profanity post questions in appropriate areas ONE question per post

7 07, 2016

## Truncated Cone SA

Truncated Cone Surface Area $SA=\pi\, R^2+\pi\,r^2+\pi\,R\,L-\pi\,r\,l$ worked examples further examples harder examples

6 07, 2016

## Truncated Cone Volume

Truncated Cone Volume $V=\frac13\pi R^2\,H-\frac13\pi r^2\,h$ or $V=\frac13\pi(R^2\,H- r^2\,h)$ worked examples further examples harder examples

11 05, 2016

## Open Cylinder Surface Area

By |2016-10-21T13:17:06+10:00May 11th, 2016|Tags: , , , |Comments Off on Open Cylinder Surface Area

Open Cylinder $SA=2\pi r h$ $SA=2\pi r h$ worked examples A cylinder, open at both ends, has a radius of 10cm and a height of 15cm. Find the surface area. $SA=2\times\pi\times10\times20$ = 1256.64cm2 $SA=2\pi r h$ r = 10, h = 20 [...]

11 05, 2016

## Cylinder Surface Area Open One End

By |2016-10-21T13:17:06+10:00May 11th, 2016|Tags: , , , |Comments Off on Cylinder Surface Area Open One End

Cylinder - Open One End $SA=\pi r^2+2\pi r h$ $SA=\pi r^2+2\pi r h$ worked examples A cylinder, open at one end, has a radius of 10cm and a height of 15cm. Find the surface area. $SA=\pi\times10^2+2\times\pi\times10\times20$ = 1570.80cm2 $SA=\pi r^2+2\pi r h$ r = 10, [...]

11 05, 2016

## Cylinder Surface Area

By |2016-10-21T13:17:06+10:00May 11th, 2016|Tags: , , , |Comments Off on Cylinder Surface Area

Cylinder $SA=2\pi r^2+2\pi r h$ $SA=2\pi r^2+2\pi r h$ worked examples A cylinder has a radius of 10cm and a height of 15cm. Find the surface area. $SA=2\pi\times10^2+2\times\pi\times10\times20$ = 1884.96cm2 $SA=2\pi r^2+2\pi r h$ r = 10, h = 20 further examples [...]

18 08, 2015

## Normal Distribution and Probabilities

Normal Distribution and Probabilities $z=\frac{x-\bar{x}}{sd}$ 68% will lie between 1 sd above and below the mean 95% will lie between 2 sd above and below the mean "very probably" 99.7% will lie between 3 sd above and below the mean "almost certainly" worked [...]

17 08, 2015

## Cones

Cones $V=\frac13\pi r^2h$      $SA=\pi r^2+\pi r l$ worked examples A sphere has a radius of 10cm. Find: a. the surface area b. the volume a. Surface area = $4\times\pi\times10^2$ = 1256.5cm2 Use the surface area formula: $4\pi r^2$ b. Volume = $\frac43\times\pi\times10^3$ = 4188.8cm3 Use the volume formula: $\frac43\pi r^3$ [...]