11) Margarita marca 9 puntos en la pizarra de modo que ninguna terna de ellos son colineales. ¿Cuántos triángulos diferentes que tengan por vértices a tales puntos se pueden dibujar? \( \begin{array}{llll}\text { A) } 60 & \text { B) } 84 & \text { C) } 90 & \text { D) } 120\end{array} \)

Graph the line containing the given pair of points and find the slope. \( (-6,0),(-7,-4) \)

\( \left. \begin{array} { l } { A B = 6,2 cm } \\ { B C = 6,8 cm } \\ { A C = 9,20 cm } \end{array} \right. \)

Explain the relationship between equal chords and their distances from the center of a circle.

If the diameter of a circle is doubled, how does it affect the circumference?

An automobile lamp's reflector is to be 4 inches across and 2 inches deep. Find an equation that models the reflector and indicate how far the bulb be from the bottom.