OR \( \left\lvert\, \begin{array}{l}\text { Prove that mid-point of a Aght angled } \\ \text { triangle is equidistant from its three } \\ \text { vertices } \\ P(-2,5), Q(1,3), R(-1,0)\end{array}\right. \)

7. A village with an actual area of \( 1 \mathrm{~km}^{2} \) is represented by an area of \( 4 \mathrm{~cm}^{2} \) on a map. (a) Express the scale of this map in the form \( 1: n \), where \( n \) is an integer.

coordinate grid below. Find the coordinates of a fourth point o that the four points form the vertice of a rectangle.

Graph the line containing the point \( P \) and having slope \( m \). \( P=(-6,3) ; m=0 \)

The midpoint between two points is \( \{1,5\rangle \). One of those points is \( \{8,3\rangle \), find the other.

Si \( P=(1,-1) \) y \( Q=(\sqrt{2},-1) \), la magnitud del vector \( \overrightarrow{P Q} \) es