Per la seguente relazione definita in \( A \), traccia il grafo che la rappresenta: \[ a \mathcal{R} b \leftrightarrow a+b \text { è un numero pari minore di } 20, A=\{a \in \mathbb{N} \mid 6<a \leq 11\} \]

Question Determine the equation of the parabola with vertex \( (1,-3) \) and focus \( (7,-3) \). Answer Attempt 1 out of 2

Determine the area of triangle \( A B C \) when \( a=3, b=5 \) and \( \angle C=72^{\circ} \)

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

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

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