When computing a correlation coefficient, if you have the degrees of freedom of 55, your sample size must be:

Your sample size must be 57 .

Step-by-step explanation:

The degrees of freedom(df) require to calculate the correlation coefficient is N-2, where N is the sample size.

If Degrees of freedom(df)  is given as 55, then

N-2 =55

Add 2 on both sides , we get

N= 55+2=57

Therefore , the required sample size = 57

1)is not similar since corresponding sides are not in the same ratio

2)are similar since corresponding sides are in the same ratio and corresponding angles are equal

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300pi

step-by-step explanation: