Diametri 12 sm olan çevrenin radiusunu tapin. \( \begin{array}{lll}\text { A) } 12 \mathrm{sm} & \text { B) } 9 \mathrm{sm} & \text { C) } 8 \mathrm{sm} \\ \text { D) } 6 \mathrm{sm} & \text { E) } 4 \mathrm{sm} & \end{array} \)

3) The exterior bisector of the vertex angle of an isosceles triangle \( \cdots \cdots . . . \). the base. \( \begin{array}{ll}\text { (a) bisects } & \text { (b) perpendicular to } \\ \text { (c) intersect } & \text { (d) parallel }\end{array} \)

In the opposite figure : \( \frac{\mathrm{BE}}{\mathrm{BC}}= \) \( \begin{array}{ll}\text { (a) } \frac{1}{2} & \text { (b) } 2 \\ \text { (c) } \frac{1}{3} & \text { (d) } 3\end{array} \)

¿Cómo se calcula el área superficial de un cubo? Presenta la fórmula utilizada.

the area of \( \triangle A B C=12 \mathrm{~cm}^{2} \), then \( \left(b^{2}+c^{2}-a^{2}\right) \tan A=\cdots \) 12 (b) 24

Cos'è un cerchio?