uestion (○ Watch Video Show Examples n \( \triangle \mathrm{PQR}, \overline{P R} \) is extended through point R to point \( \mathrm{S}, \mathrm{m} \angle P Q R=(x+18)^{\circ}, \mathrm{m} \angle Q R S=(6 x-13)^{\circ} \) and \( \mathrm{m} \angle R P Q=(2 x-4)^{\circ} \). Find \( \mathrm{m} \angle Q R S \).

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

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

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

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

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?