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The centre of the larger circle is at the midpoint of one side of an equilateral triangle and the circle touches the other two sides of the triangle. A smaller circle touches the larger circle and two sides of the triangle. If the small circle has radius 1 unit find the radius of the larger circle.
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Age 14 to 16 Challenge Level:
This problem follows on from Translating Lines and Reflecting Lines.
I took the graph $y=4x+7$ and performed the four transformations shown on the cards below.
Unfortunately, I can't remember the order in which I carried out the four transformations, but I know that I ended up with the graph of $y=4x-2$.
Can you find an order in which I could have carried out the transformations?
There is more than one way of doing this - can you find them all?
Can you explain why different orders can lead to the same outcome?
What other lines could I have ended up with if I had performed the four transformations in a different order?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.