61. A fountain pen with a cylindrical barrel of diameter 2 cm and height 10.5 cm , filled with ink, can write 3300 words. How many words can be written with that pen using 100 ml of ink? (Take \( 1 \mathrm{cc}=1 \mathrm{ml} \) ) \( \begin{array}{ll}\text { (a) } 40,000 & \text { (b) } 30,000\end{array} \)

12. G'ildirak aylanasining uzunligi 1,5 m . G'ildirak 20,5 marta aylanganda qancha masofani bosib o'tadi? G'ildirak 231 m masofani bosib o'tganda necha marta aylanadi?

Soit \( A B C \) un triangle. Eet \( F \) deux points tel que: \( \overrightarrow{B E}=2 \overrightarrow{A C} \quad \) et \( \overrightarrow{C F}=\frac{1}{2} \overrightarrow{A B} \) 1) Construire les points \( E \) et \( F \). 2) Montrer que : \( \overrightarrow{A E}=\overrightarrow{A B}+2 \overrightarrow{A C} \quad \) et \( \overrightarrow{A F}=\frac{1}{2} \overrightarrow{A B}+\overrightarrow{A C} \)

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

23. Find the equation of a line. Whoso intercepts on \( x \) and \( y \) axis are 4 and -6

In a right triangle, the lengths of the legs are given as 12 units and 5 units. Use the Pythagorean theorem to find the length of the hypotenuse.