an investment of 40000was made by a business club. the investment was split in three parts and last for a year. the first part of the investment earned 8% interest, the second 6%, and the third one 9%. the total interest for the investment was 3600. the interest from the first investment was 4 times the interest from the second. find the amount of the three parts of the investment

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 .