A quadrilateral is drawn in such a way that three of its sides are congruent, and the fourth side is congruent to both of the diagonals. Find the measures of the vertex angles in the quadrilateral.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)

The shelves will hold 270 books in total

Where is the picture