6. Find the volume of the box (parallelepiped) determined by \( u=4 i+5 j-2 k \), \( v=2 i+3 j+5 k \) and \( w=5 i+4 j+8 k \)

5. A tree is broken at a height of 5 m from the ground and its top touches the ground at a distance of 12 m from the base of the tree. Find the original height of the tree.

\( =11 \mathrm{~cm}^{2} \) Example 2 The area of a sector of a circle is 38.5 cm if the angle subtended at the centre is 90

3 треугольнике \( A B C \) к стороне \( A B=9 \) см опущена высота, длина которой составила 8 см Найди площадь этого треугольника и дай ответ з квадратных сантиметрах.

A tree is broken at a height of 5 m from the ground and its top touches the ground at a distance of 12 m from the base of the tree. Find the original height of the tree.

4. \( A B C \) үшбұрышында \( B C \) биссектрисасы сызылған, \( A K=4 \) см және \( K S=5 \mathrm{~cm} A B C \) үшбұрышының периметрі 36 см AB және BC қабырғаларын табыңыз.