Two diagonals

The rhombus has a side length 12 cm and length of one diagonal 21 cm. What is the length of the second diagonal?

Correct result:

u2 =  11.619 cm

Solution:

a=12 u1=21 a2=(u1/2)2+(u2/2)2 u2=2⋅ a2−(u1/2)2=2⋅ 122−(21/2)2=3 15=11.619 cm

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