ABCD- ромб, ac =40 см bd 42 см найти АВ

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To find the length of AB in the rhombus ABCD, we can use the Pythagorean Theorem.

Firstly, we know that the diagonals of a rhombus are perpendicular bisectors of each other, so we can split the rhombus ABCD into two right triangles - triangle ABD and triangle BCD.

In triangle ABD, we have the following information:

We can find the length of AB using the Pythagorean Theorem:
AB^2 = AD^2 - BD^2
AB^2 = 40^2 - 42^2
AB^2 = 1600 - 1764
AB^2 = -164

Since AB^2 is negative, this means that there is a mistake in the provided information or the calculations. Please double check the values or provide any additional information if available.