Le diagonali di un rombo misurano 48 cm e 24 cm . Il rombo è equivalen1 quadrato. Calcola: (a) larea del rombo: (b) la lunghezza del lato del quadrato.

1 Choose the correct answer from those given: \( \begin{array}{llll}\text { (1) The distance between the point }(-4,-3) \text { and the } X \text {-axis equals ............ length u } \\ \begin{array}{llll}\text { (a) }-3 & \text { (b) } 3 & \text { (c) } 4 & \text { (d) }-4\end{array}\end{array} l^{\circ} \)

3. Find a vector perpendicular to the plane of using the points \( P=(1,2,-4) \), \( Q=(2,5,-7) \) and \( R=(3,-5,-1) \). Also find area of the parallelogram and area of triangle. Furthermore find a unit vector perpendicular to the plane using these points.

1. If a rectangle has a length of 10 m and a height of 5 m , what is its perimeter?

Determine if the following lines are parallel, perpendicutar, or neither. \[ \begin{array}{l}y=\frac{x}{3}-7 \\ y=-3 x+5\end{array} \]

8. Find the volume of the box (parallelepiped) determined by the points \( P=(1,2,4) \), \( Q=(2,-5,8), R=(4,2,-3) \) and \( S=(3,5,-6) \). 9. Find the volume of the box (parallelepiped) determined by the points \( P=(8,5,3) \), \( Q=(4,6,7), R=(-4,-2,9) \) and \( S=(3,-3,-4) \).