Maths Revision- end of year test

Frage	Antworten
When do you use trigonometry? (sOhcAhtOa)	In right angled triangles where an interior angle is involved (not the 90 degree one) and you know 2 measurements.
When do you use Pythagoras? (a squared + b squared = c squared)	When no angles are involved, trying to find a length.
In Pythagoras where is c?	Opposite the right angle.
When is the sine rule used? (a/sinA = b/sinB = c/sinC)	On a non-right angled triangle to find angles or sides.
When is the cosine rule used?	In a non-right angled triangle when the is no matching pair.
What is a good way to solve a quadratic equation? (x squared+x+n=0)	The quadratic formula in the front of paper.
In a histogram what is the width and how do you get it?	The class width = the range between each individual variable category ie-'height 0<20' would be the difference between 0 and 20.
In a histogram what is the height and how do you calculate it?	frequency density = freq density/class width
In a histogram how do you find out the mean?	Total(midpoint x freq)/total freq
How do you solve an algebraic equation graphically?	1) Plot 2) state where they cross
What is 'BIDMAS'?	Calculate things in the order of: Brackets, Indices(powers), Division, Multiplication, Addition, Subtraction.

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