En un triángulo \( P Q R \) se prolonga \( \overline{A B}(A \quad y \quad B \) son puntos medios de \( \overline{P Q} \) y \( \overline{Q R} \) respectivamente ) hasta interceptar en \( F \) a una paralela a \( \overline{P Q} \) que pasa por \( R \). SI: \( A B=32 \) cm . ¿Cuánto mide \( B F \) ?

7. Sachin lives in a multistoried apartment. One day he was flying his kite firmy the road in front of his apartment. He was at a distance of 8 m from the baseft Also, the kite was just touching the top of the apartment. The length of the stiment (a) Find the height of the building. (b) As per your opinion, which values are missing in Sachin?

17. If 3 angles of a quadrilateral is added and the result \( 280^{\circ} \). Find the fourth angle.

Determine the equation of the parabola with focus \( (-4,5) \) and directrix \( x=16 \)

Øvelse 2.1 Bestem arealet af trekant \( A B C \) når \( a=3, b=5 \) og \( \angle C=72^{\circ} \).

17. Найти уравнение плоскости, перпендикулярной оси оу и проходящей через точку \( A(1,-2,2) \). Построить плоскость.