Diagonals of diamond

Find the area and circumference of the diamond ABCD with 15m and 11m diagonals.

Correct result:

S =  82.5 m2
o =  37.2022 m


u1=15 m u2=11 m S=u1 u22=15 112=1652=1652 m2=82.5 m2
a=(u1/2)2+(u2/2)2=(15/2)2+(11/2)29.3005 m o=4 a=4 9.3005=2 346=37.2022 m

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