Sadhana Bhadoriya

Ex – 11.1 Que No. 10 Q.10) An umbrella has 8 ribs which are equally spaced (see Fig. 11.10). Assuming umbrella to be a flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella. Solution:-

Ex – 11.1 Que No. 9 Q.9) A brooch is made with silver wire in the formof a circle with diameter 35 mm. The wire is alsoused in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig. 11.9. Find : Solution:-

Ex – 11.1 Que No. 8 Q.8) A horse is tied to a peg at one corner of a square shaped grass field of side 15 m by means of a 5 m long rope (see Fig. 11.8). Find: Solution:-

Ex – 11.1 Que No. 7 Q.7) A chord of a circle of radius 12 cm subtends an angle of 120° at the centre. Find the area of the corresponding segment of the circle. (Use π = 3.14 and √3 = 1.73) Solution:-

Ex – 11.1 Que No. 6 Q.6) A chord of a circle of radius 15 cm subtends an angle of 60° at the centre. Find the areas of the corresponding minor and major segments of the circle. (Use π = 3.14 and √3 = 1.73) Solution:-

Ex – 11.1 Que No. 5 Q.5) In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find: Solution:-

Ex – 11.1 Que No. 4 Q.4) A chord of a circle of radius 10 cm subtends a right angle at the centre. Find the area of the corresponding : Solution:-

Ex – 11.1 Que No. 3 Q.3) The length of the minute hand of a clock is 14 cm. Find the area swept by the minute hand in 5 minutes. Solution:-

Ex – 11.1 Que No. 2 Q.2) Find the area of a quadrant of a circle whose circumference is 22 cm. Solution:-

Ex – 11.1 Que No. 1 Q.1) Find the area of a sector of a circle with radius 6 cm if angle of the sector is 60°. Solution:-