For calculating the allowable stress of long columns. The following empirical formula , is known as

For calculating the allowable stress of long columns. The following em

1.	For calculating the allowable stress of long columns. The following empirical formula , is known as
A.	Straight line formula
B.	Parabolic formula
C.	Perry's formula
D.	Rankine's formula
Answer» B. Parabolic formula

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For calculating the allowable stress of long columns. The following empirical formula , is known as

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