CBSE Class 10 Mathematics (Basic) — Areas Related to Circles

14. The length of the arc of the sector of a circle with radius 21 cm and of central angle 60°, is : (a) 22 cm (b) 44 cm (c) 88 cm (d) 11 cm

15. The hour hand of a clock is 7 cm long. The angle swept by it between 7:00 a.m. and 8:10 a.m. is : (a) $\left(\frac{35}{4}\right)°$ (b) $\left(\frac{35}{2}\right)°$ (c) $35°$ (d) $70°$

38. Case Study - 3. A brooch is crafted from silver wire in the shape of a circle with a diameter of 35 cm. The wire is also used to create 5 diameters, dividing the circle into 10 equal sectors as shown in figure. (i) What is the radius of circle ?

38. (ii) What is the circumference of the brooch ?

38. (iii) (a) What is the total length of silver wire required ?

38. (iii) (b) What is the area of each sector of the brooch ?