% change= change divided by original times 100. E.g. A magazine was sold for 50p last year. This year it is sold for 55p.What is the percentage increase? 55-50=5. 5 dived by 50= (5 divided by 5)=1 (50 divided by 5)=10. 1 divided by 10 times 100=10%
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What is the area of a circle?
PI * radius * radius. The radius of a circle is 4cm. Find out the area. 3.14 * 4*4=50.2cm squared
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What is circumference?
C=pi times diameter. Find the circumference of a wheel with 50cm. 3.14 times 50=157cm.
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What is the formula for exterior angles?
360 divided by n (the number of sides).
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What is the formula for interior angles?
(Number of sides-2) times 180. (6-2)=4 times 180=720.Now add up all the numbers. 120+140+130+x+58+x-4+x=444. 720-444=276. Now add all the x's. There are 3x's. So 276 divided by 3=92. Use this to work out the other angles.
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What are polygons?
shapes that have the same size, length and angle. Each side is the same.
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What are regular and irregular tessellations?
Tessellations are shapes that have a repeating pattern and interlock without any gaps. For example hexagons do tessellate as they are all the same size and they fit together with no gaps.
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What is Pythagoras theorom?
a squared +b squared+c squared. The right angle of a triangle is 3cm and the side is 4cm. Find the hypotenuse. 3 *3=9 4 *4=16. (16+9)=25. Now find the square root of 25. Square root of 25=5cm.
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Other cards in this set
Card 2
Front
What is the area of a circle?
Back
PI * radius * radius. The radius of a circle is 4cm. Find out the area. 3.14 * 4*4=50.2cm squared
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