Diamond and diagonals

A diamond has diagonals f = 8 cm and g = 6 cm long. How long is this diamond perimeter? (Calculate it!)

Correct result:

o =  20 cm

Solution:

f=8 cm g=6 cm  a=(f/2)2+(g/2)2=(8/2)2+(6/2)2=5 cm o=4⋅ a=4⋅ 5=20 cm

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