Trisha noticed that three copies of a certain triangle could be arranged in a way that the three angles of the triangle form a straight line. what can she conclude from this observation a. that each interior angle of the triangle must measure 60* b. exterior must measure 60* c. sum of interior angles must be 180* d. sum of exterior angles must be 180* show work and i need it desperately

C) sum of interior angles must be 180°.

This is because a straight line = 180°, so if the interior angles of a triangle = 180° they can form a straight line if arranged correctly.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.