1. The diagram below shows rectangle RSTU with two diagonals drawn. (6х- 15)° To find the value of x, Justin wrote the following steps. 1. m 2 STR + m Z RTU = 90° 2. m 2 RTU = 27° 3. 6х - 15 - 27 4. 6x = 42 5. х 7 Which statement can be used to justify the first step? The alternate interior angles formed by the diagonals are congruent. The diagonals of a rectangle are congruent. Opposite angles in a rectangle are congruent. The angles at each vertex of the rectangle are right angles.

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