If all four interior angles of quadrilateral p have the same measure, which of the following statements must be true?

1. all sides of p have equal length.
2. the diagonals of p are perpendicular.
3. the measure of each interior angle of p is 90 degrees.

in advance!

This is so hard and it’s for a test

Given: klmn is a parallelogram m? n=3m? k, lf ? kn , ld ? nm kf=2 cm, fn=4 cm find: lf, ld

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?