The golden rectangle ratio: 1:(1 + the square root of 5) over 2 or about 1.618
5 cm
If you mean the golden rectangle then each of its 4 interior angles measures 90 degrees but if you mean an equilateral triangle then each of its 3 interior angles measures 60 degrees
when golden rectangle constructed?
phi is incorperated into the golden rectangle, because if you divide the longer side of the golden rectangle by the shorter sid, the answer will be phi.(1.168...)
Euclid was the one to construct the golden rectangle
Each angle of a rectangle measures 90 degrees.
true
15 (it is actually really close to 15 and a half)
The diagonal is 25 feet.
No, there's no golden pentagon.
conclusion
The Golden Rectangle is a geometrical figure whose side lengths are in the golden ratio. It can be made with only a compass and a straight edge.