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The most beautiful rectangles are golden...

The most beautiful rectangles are golden rectangles. For these golden recțangles ratio of the length and breadth are always `1+sqrt5: 2`.
a) What is the length of a golden rectangle is its breadth is `10 cm ?`
b) If the length is `l` and breadth is `b`, write the relation between length and breadth as an equation.
c) Whether the length and breadth of golden rectangle are proportional? What is the proportionality constant.

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