2-Tracez un segment "CD" de 12 cm . Pliez votre feuille de manière à ce que les extrémités "C" et "D" se superposent. Dépliez la feuille et marquez le point de pliure : il représente le milieu "M" de "CD".

\( \left. \begin{array} { l } { P = \pi 2 r } \\ { 15.2 = \pi 2 r } \\ { \frac { 15.2 } { \pi } = 2 r } \\ { \frac { 15.2 } { 2 \pi } = r } \end{array} \right. \)

10. Find the equations of straight lines each of which is parallel to and at a distance of \( \sqrt{5} \) from the line \( x+2 y-7=0 \).

arallelogram B. square C. trapezold \( \quad \) D. rectangle raph the circle and find the equation. Use graphing paper. he endpoints of the radius are at \( (-4,3) \) and \( (4,-5) \) and the center lies at QIV.

8. Dans le plan muni d'un repère \( (0, \vec{i}, j) \), on donne le point \( A(-2 ; 3) \), les vecteurs \( \begin{array}{l}\vec{u}=\vec{i}+\vec{j} \text { et } \vec{v}=\vec{i}-\vec{j} \\ 1^{\circ} \text { Démontrer que le couple }(\vec{u}, \vec{v}) \text { est une base } \\ \text { du plan. }\end{array} \).

A triangle has base \( 4 \frac{1}{7} \) feet and height \( 7 \frac{1}{6} \) feet. Find the area of the triangle as a mixed number.