12. In the figure, each small cube has edges that are \( \frac{1}{3} y d \) long. Which expression can you use to find the volume of the rectangular prism in cubic yards? A \( 2 \times 4 \times 5 \) (B) \( 2 \times 4 \times 5 \times \frac{1}{3} \times \frac{1}{3} \times \frac{1}{3} \) C \( \frac{1}{3} \times \frac{1}{3} \times \frac{1}{3} \) D \( 2 \times 4 \times 5 \div\left(\frac{1}{3} \times \frac{1}{3} \times \frac{1}{3}\right) \)

47. The measure, in degrees, of each interior angle of a regular polygon with \( n \) sides is given by \( \frac{(n-2) \mid 80}{n} \). What is the sum of the measures of the interior angles of a regular octagon?

50. Ten distinct lines lie in the same plane. No pair of these lines is parallel to each other, and no more than two of the lines intersect at any one point. How many poins lie on more than one of these ten lines? (A) 10 (B) 36 (D) 45 (D) 55 (E) 100

2] \( A B C D \) is aparallelogram, \( m(\angle A)+m(\angle C)=200^{\circ} \), then \( m(\angle B)=\ldots(50,80,100,160) \)

lunghezza della circonferenza di raggio maggiore? \[ [\approx 38,81 \mathrm{~m}] \] La somma dei raggi di due circonferenze misura 15 cm e uno è i \( \frac{2}{3} \) dell'altro. Determina la lunghez- za delle due circonferenze. \[ [12 \pi \mathrm{~cm} \approx 37,68 \mathrm{~cm} \text { e } 18 \pi \mathrm{~cm} \approx 56,52 \mathrm{~cm}] \]

2 complementary angles have the sum of ............... \( 360^{\circ} \) B. \( 90^{\circ} \) C. \( 180^{\circ} \) D. \( 60^{\circ} \)