A capsule of medicine is in the shape of a sphere of diameter 3.5 mm . How much medicine \( \left(\right. \) in \( \mathrm{mm}^{3} \) ) is needed to fill this capsule? Summary

6. \( A D, B E \) and \( C F \) are the three altitudes of \( \triangle A B C \). Show that \( \begin{array}{ll}\text { (i) Perimeter of triangle } A B C>2 A D & \text { (ii) Perimeter of triangle } A B C>2 B E \\ \text { (iii) Perimeter of triangle } A B C>2 C F & \text { (Perimeter of triangle } A B C)>2(A D+B E+C F)\end{array} \)

Find equation of straight line through \( (-1,4) \) and perpendicular to the line passing through \( (3,0) \) and \( (1,-2) \).

Explain the relationship between the area of cross-sections of a three-dimensional shape and its total volume.

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

e) La somma e la differenza delle diagonali di un rombo misurano 126 cm e 18 cm . Calcola la misura del raggio della circonferenza inscritta nel rombo.