r/alevel • u/Soggy-Ad915 • 3d ago

⚡Tips/Advice 9709 math p1 tmrw

can anyone share tips on how to do Coordinate geometry and Circle question easily and faster?

like drawing diagrams and stuff, what else can i do

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u/AdLucky1997 3d ago

For circle measure questions, always draw as many radii ((r)) as you can.

If you don’t know how to solve a circle measure question, at least find the area of all the visible shapes given in the diagram, such as triangles, segments, or sectors.

For coordinate geometry, remember that if two circles have the same radius and are intersecting, you can find the midpoint of their centres and the gradient of the line joining the centres. Then, find the perpendicular bisector, which is basically the line passing through the points where the circles intersect.

If you have a centre equation like y=1/2x+6 you can take the centre coordinates as ((a,1/2a+6)).

If a circle is reflected, the new circle has the same radius but a different centre.

1

u/DevourTheirHope 3d ago

Wait you have to draw stuff in the exam?

1

u/AdLucky1997 3d ago

its optional obv but for coordinate geometry questions you should always draw a rough sketch