Nell'esagono regolare \( A B C D E F \) congiungi i punti medi dei lati \( A B, A F, D C \) e \( D E \), e dimostra che il quadrilatero ottenuto è un rettangolo.

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?

26) En un triángulo \( A B C \), se traza la altura \( \overline{B H} \). SI: "D", "E" y "F" son puntos medios de \( \overline{A B} \); \( \overline{B C} \) y \( \overline{A C} \) respectivamente y se sabe que \( E F \) \( =6 \mathrm{~cm} \). Halle la medida de DH . a) 12 cm b) 14 cm c) 6 cm d) 8 cm e) 10 cm

11. Adott az \( A B=4 \mathrm{~cm} \) szakasz. Vedd fel az \( A B \) egyenes egyik oldalán az \( E, F \) és \( G \) pontokat úgy, hogy \( E A=E B=3 \mathrm{~cm}, F A=F B=5 \mathrm{~cm} \) és \( G A=G B=7 \mathrm{~cm} \) legyen. Igazold, hogy: a) az \( E, F \) és \( G \) kollineáris pontok; b) a \( G E \) egyenes az \( A B \) szakasz felezőmerôlegese.

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

The diameter of a circle is 10.5 cm . Calculate the perimeter of the circle use \( \pi=22 / 7 \)