12. [s punti] In un trapezio isoscele la diffe- renza delle due basi misura 72 cm e l'altezza è \( \frac{2}{3} \) di questa differenza. Sapendo che l'area del trapezio è \( 3648 \mathrm{~cm}^{2} \) calcola l'area di un rettangolo avente le dimensioni lunghe quanto le due basi del trapezio. \( \begin{array}{lll}\text { a. } 4480 \mathrm{~cm}^{2} & \text { b. } 1600 \mathrm{~cm}^{2} & \text { c. } 2240 \mathrm{~cm}^{2}\end{array} \)

Write the coordinates of the vertices after a rotation \( 180^{\circ} \) clockwise around the origin.

Angles 3 and 5 are \( \square \) and \( m \angle 5 \) is \( (2 x+11)^{\circ} \).

13. Una lámpara está instalada en lo alto de un poste de 15 pies de altura. Un hombre de 6 pies de estatura se aleja caminando desde el poste con una rapidez de 5 pies/s a lo largo de una trayectoria rectilínea. ¿Qué tan rápido se desplaza la punta de su sombra cuando el hombre está a 40 pies del poste?

\begin{tabular}{l|l|}\hline \( \begin{array}{l}\text { Sample Response: Because vertical angles are } \\ \text { congruent, angles } 1 \text { and } 4 \text { are congruent. Because } \\ \text { corresponding angles are congruent, angles } 4 \text { and } 8 \text { are } \\ \begin{array}{l}\text { congruent. Because angle } 4 \text { is congruent to both } 1 \text { and } 8, \\ \text { angle } 1 \text { is congruent to angle } 8 .\end{array}\end{array} \) & \( \begin{array}{l}\text { What did you include in your response? Check all that } \\ \text { apply. } \\ \square \text { vertical angles theorem } \\ \square \text { corresponding angles theorem } \\ \square \text { transitive property }\end{array} \) \\ \( \square \) supplementary angles \\ \( \square \) linear pairs \end{tabular}

526. The degree measures of the arcs \( A B \) and \( A C \) of a circle are \( 180^{\circ} \) and \( 38^{\circ} \) respectively. Find the angle \( B A C \) (consider wo wases).