8.3 the length of the diameter of the circle. 8.4 the area of the quadrilateral PQRS.

43. What is the difference between the total surface area and curved surface area of a cylinder whose radius is equal to 10 cm ? \( \begin{array}{ll}\text { (a) } 200 \pi \mathrm{~cm}^{2} & \text { (b) } 300 \pi \mathrm{~cm}^{2} \\ \text { (c) } 100 \pi \mathrm{~cm}^{2} & \text { (d) } 10 \pi \mathrm{~cm}^{2}\end{array} \)

5.3. A diameter and a chord, which is equal to the radius, are passed from the given point of the circle. Find the angle between them.

В треугальнике \( A B C \) сторона \( A B \) равна 47 , угол \( C \) равен \( 150^{\circ} \) Найдите радиус описанной около этого треугольника окруж ности. Ответ:

A rectangular prism has a length of 5 cm, a width of 3 cm, and a height of 4 cm. Calculate its volume.

5.4. Two chords equal to the radius are drawn from a given point of the circle. Find the angle between them.