If each interior angle of a regular polygon measures \( 168 ^ { \circ } \) , how many sides does the polygon have? A \( 12 \) sides B \( 15 \) sides C \( 25 \) sides D \( 30 \) sides 

Un cilindro y un cono tienen la misma base y altura. Si el radio de la base es de 4 cm y la altura es de 9 cm, calcula el volumen del cilindro y el volumen del cono.

Select all of the options which are true of the perpendicular bisector of line AB. It is a fixed distance from line AB It meets line AB at \( 90^{\circ} \quad \) It passes through \( A \) It meets line AB at \( 180^{\circ} \) It passes through B It does not meet line AB

Calcular el volumen de un cilindro dado si se corta a través de su dirección vertical, formando cross sections semicirculares con un diámetro de 6 unidades.

\( \begin{aligned} \text { B.ea } & =l \times b \\ & =8 \times 3 \\ & =24 \mathrm{~cm}\end{aligned} \)

0) A circle with diameter of length 20 cm ., passes through the vertices of \( \triangle A B C \) which is an acute-angled triangle in which \( B C=10 \mathrm{~cm} \)., then \( \mathrm{m}(\angle A)=\ldots \ldots \ldots \ldots \) \( \begin{array}{llll}\text { (a) } 30 & \text { (b) } 60 & \text { (c) } 45 & \text { (d) } 150\end{array} \)