Rhombus and diagonals

The lengths of the diamond diagonals are e = 48cm, f = 20cm. Calculate the length of its sides.

Correct result:

a =  26 cm

Solution:

e=48 cm f=20 cm  a2=(e/2)2+(f/2)2  a=(e/2)2+(f/2)2=(48/2)2+(20/2)2=26 cm

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