72688
Description
Flashcards by Emma Boxley, updated more than 1 year ago
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Created by Emma Boxley
over 11 years ago
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| Question | Answer |
| What is the formula for the area of a circle? | pi x radius^2 |
| What is the formula for circumference? | 2 x r x pi |
| What is a sector? | It is a portion of a circle. |
| Whta is a radius? | Half the diameter of a circle. |
| State the formula for the perimeter of a sector. | (Ɵ/360x 2 x pi x r) x 2r The part in brackets is the formula to work out the arc length and the 2r represents the sides of the sector. |
| How do you work out an arc length? (State as a formula) | Ɵ/360x 2 x pi x r Ɵ is the angle of the sector. |
| Ɵ of a sector is 60 degrees. The radius is 8 cm. What is the area of the sector? | Ɵ/360 x pi x 8^2= 235cm^2 |
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