If you have a cone with a base diameter of 8 inches and a height of 6 inches, calculate the total surface area.

Найдите площадь ромба, сумма длин диа которого 42 , а сторона равна 15 .

Consider the two planes \( P \) and \( Q \), where \[ \begin{array}{l}P: \quad 6 x-2 y+3 z+8=0 ; \\ Q: x-3 y+5=0 .\end{array} \] Find the equation of a third plane \( R \) which is perpendicular to both \( P \) and \( Q \) and contains the point \( (2,2,3) \).

81. Calcola il perimetro e l'area di un foglio A4 che misura 210 mm per 297 mm . Verifica se la sua area sia o meno \( \frac{1}{16} \) di un metro quadra- to, come riportato sulla confezione. [1014 mm; \( \left.62370 \mathrm{~mm}^{2} ; \ldots\right] \)

Ankit has a block of ice in the shape of a cube that has a volume of \( 27 \mathrm{ft}^{3} \). Ankit plans to cut the ice block into small ice cubes that measure 2 inches in all directions. How many such ice cubes can Ankit create? (Note: There are 1728 cubic inches in \( 1 f^{3} \).)

0. Найдите площадь ромба, сумма длин диагонал которого 28 cm , а сторона 10 cm .