The exterior angles of triangle \( U V W \) are \( \angle X, \angle Y \), and \( \angle Z \), and they are adjacent to \( \angle \mathrm{U}, \angle \mathrm{V} \), and \( \angle \mathrm{W} \), respectively. If \( \mathrm{m} \angle \mathrm{V} \) is \( 99^{\circ} \), and \( m \angle X \) is \( 155^{\circ} \), what is \( m \angle W \) ? A. \( 25^{\circ} \) B. 124 C. \( 99^{\circ} \) D. \( 56^{\circ} \)

Calcola la lunghezza di una circoner tro 8 cm , approssimando \( \pi \) ai centesimi.

(a) Find the area of the \( \triangle P Q R \). (b) Find \( Q M \). 9. In the given figure \( D L \) and \( B M \) are the heights corresponding to sides \( A B \) and \( A D \) respectively of parallelogram \( A B C D \). If the area of parallelogram is \( 300 \mathrm{~cm}^{2}, A B=30 \mathrm{~cm} \) and \( A D=20 \mathrm{~cm} \). Find the length of \( B M \) and \( D L \).

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 \( m(\angle B)=\ldots(50,80,100,160) \)

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 points lie on more than one of these ten lines? (A) 10 (B) 36 (C) 45 (D) 55 (E) 100