/Tag: General
11 07, 2018

Arc Length

By |2018-12-01T16:29:32+10:00July 11th, 2018|Tags: , , , , |0 Comments

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

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 [...]

17 08, 2015

Cones

By |2016-10-21T13:17:21+10:00August 17th, 2015|Tags: , , , , |0 Comments

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: $$\frac43\pi r^3$$ [...]

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