Question 9 of 10 If a shape is a regular hexagon with six sides, which of the following must be true? Check all that apply. \( \square \) A. It has reflectional symmetry. \( \square \) B. It has six lines of symmetry. \( \square \) C. It has an unlimited number of lines of symmetry. \( \square \) D. It has exactly one line of symmetry.

Exercice 4 L'espace est rapporté à un repère \( (O ; i ; j ; k) \) On considère les points \( A(2 ; 3 ;-1), B(1 ; 3 ; 4), C(0 ; 1 ;-3), D(2 ; 0 ; 0) \) et \( E(-2 ;-2 ; 8) \) 1) Montrer que les points \( A, B \) et \( C \) définissent un plan. 2) Peut-on trouver deux réels \( a \) et \( b \) tels que : \( \overline{D E}=a \overline{A B}+b \overline{A C} \) 3) Que peut-on en déduire pour la dicite (DE) ?

Considera un poligono regolare circoscritto a una circonferenza con diametro di 15 cm . II perimetro del poligono misura 114 cm . Determina la sua area.

Un poligono regolare il cui perimetro misura 246 cm e circoscritto a una circonferenza il cui diametro misura 48 cm . - Determina la sua area.

Question \( \operatorname{In} \triangle N O \bar{N}, \overline{O P} \cong \overline{N O} \) and \( \mathrm{m} \angle O=57^{\circ} \). Find \( \mathrm{m} \angle N \). Answer Attempt iout of 2 \( \square \)

\( \left. \begin{array} { l } { \hat { \alpha } = 2 x - 18 ^ { \circ } } \\ { \hat { \beta } = 5 x - 5 ^ { \circ } } \end{array} \right. \)