The two-way frequency table below shows data on twins in a patient's family history and pregnancies with twins for pregnancies Dr. Ward has attended.
Complete the following two-way table of column relative frequencies.
(If necessary, round your answers to the nearest hundredth.)
Twins in family history Twins not in family history
8
26
8
Twins born
Single child born
125
841
Twins in family history Twins not in family history
Twins born
Single child born
Column total
1.00
1.00

Given: abcd is a square. prove: ac ? bd. we are given that abcd is a square. if we consider triangle aeb and triangle aed, we see that side is congruent to side ad because sides of a square are congruent. we know that side ae is congruent to side ae by using the . finally, we know that side de is congruent to side because the diagonals of a square bisect each other. therefore, triangle aeb is congruent to triangle aed by congruency. we see that angle aed and angle aeb are a linear pair, and congruent by cpctc. thus, the measure of these angles will be 90°, and diagonal ac is perpendicular to diagonal bd by the .