if the short side of a golden rectangle is 8.5 cm, the long side is wut a)3.5 b)5.3 c)13.8 d)20.4?

Answer 1

The golden ratio phi is 1.618...

1.618 x 8.5 cm. = 13.753

And if you divide by one less than phi (0.618...) you get a similar answer:

8.5 / 0.618 = 13.754

This is the definition of the golden ratio so you better memorize its value at least to a few decimal places.

by the way c) is the best answer.

Answer 2

If you know the golden ratio, Φ, is (1+√5)/2 = 1.62, you just multply 8.5 by 1.6 and get 13.6. Allowing for a little roundoff, 13.8 is your closest choice.

Answer 3

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