(c) The planes \( \Pi_{2} \) and \( \Pi_{3} \) are with equations \( \left.2 x+2 y+1\right) \) respectively, where \( p \) is a constant. (i) Find the vector equation of the line of intersection between planes \( \Pi_{1} \) and \( \Pi_{2} \). (ii) Determine the value of \( p \) such that the planes \( \Pi_{1}, \Pi_{2} \) and \( \Pi_{3} \) do not have any common point.

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 \( \mathrm{m}(\angle A)=\ldots \ldots \ldots \ldots \) \( \begin{array}{llll}\text { (a) } 30 & \text { (b) } 60 & \text { (c) } 45 & \text { (d) } 150\end{array} \)

Qual é a definição de um círculo?

A cone has a base radius of 4 cm and a height of 9 cm. Calculate its volume.

elect all of the options which are true of the perpendicular bisector of 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.