Use the diagonals to determine whether a parallelogram with vertices \( P(-4,0), Q(0,4), R(4,0) \), and \( S(0,-4) \) is a rectangle, rhombus, or square. Give all the names that apply. \( P R \neq Q S \), so \( P Q R S \) is not a rectangle or a sque The slope of \( \overline{P R}=1 \), and the slope of \( \overline{Q S}=0 \), is not a rhombus. \( P R=Q S \), so \( P Q R S \) is a rectangle or a square. The slope of \( \overline{P R}=0 \), and the slope of \( \overline{Q S} \) is undefined, so \( \overline{P R} \perp \overline{Q S} . P Q R S \) is a square. \( P R \neq Q S \), so \( P Q R S \) is not a rectangle or a sque The slope of \( \overline{P R}=1 \), and the slope of \( \overline{Q S}=2 \), \( P Q R S \) is not a rhombus. \( P R=Q S \), so \( P Q R S \) is a rectangle or a square. The slope of \( \overline{P R}=1 \), and the slope of \( \overline{Q S}=2 \), \( P Q R S \) is not a rhombus. \( P Q=Q R=R S=S F \) so \( P Q R S \) is square.

What is the formula for calculating the surface area of a cone?

6. In un trapezio \( A B C D \), di base maggiore \( A B \), l'ampiezza di \( \widehat{A} \) supera di \( 15^{\circ} \) l'ampiezza di \( \widehat{B} \). La somma delle am- piezze di \( \widehat{A} \) e \( \widehat{B} \) è \( 65^{\circ} \). Determina l'ampiezza di ciascuno dei quattro angoli del trapezio. \[ \left|\widehat{A}=40^{\circ}, \widehat{B}=25^{\circ}, \widehat{C}=155^{\circ}, \widehat{D}=140^{\circ}\right| \]

Exercice 9. Soient les points \( A(-5,4) ; B(-3,6) ; C(-1 ; 2) \) a Écrire l'équation de \( \left(\Delta_{1}\right) \) la médiatrice de \( [A B] \). b Écrire l'équation de \( \left(\Delta_{2}\right) \) la médiatrice de \( [A C] \). c Déterminer les coordonnées de \( \Omega \) le point d'inter- section de \( \left(\Delta_{1}\right) \) et \( \left(\Delta_{2}\right) \). d Déduire l'équation du cercle circonscrit au triangle ABC.

3.1 Definieer die term "refleksiesimmetrie"

13. Şəkildə, düz xətt üzərində neçə şüa var? \( \begin{array}{lllll}\text { A) } 8 & \text { B) } 5 & \text { a A B C D } \\ \text { C) } 10 & \text { D) } 6 & \\ \text { E) } 12 & \end{array} \)