A brooch is made with silver wire in the form of a circle with diameter 35 mm.The wire is also used in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig.12.12

Find:(ii)the area of each sector of the brooch.

A brooch is made with silver wire in the form of a circle with diameter 35 mm.The wire is also used in making 5 diameter which divide the circle into 10 equal sectors as shown in Fig.12.12 .Find:(i)the total length of the silver wire required.

From each cornor of a square of side 4 cm a quadrant of a circle of radius 1 cm is cut and also a circle of diameter 2 cm is cut as shown in Fig.12.23.Find the area of the remaining portion of the square.

In given figure sectors of two concentric circles of radius 7 cm and 3.5 cm are shown. Find the area of the shaded region.

Fig.12.3 depicts an archerytarget marked with its five scoring regions from the centre outwards as Gold,Red,Blue,Black and White.The diameter of the regions representing Glod score is 21 cm and each of the bands is 10.5 cm wide.Find area of each of the five scoring regions.

A sector from teo concentric circle is shown in Fig.14.If the radii of the circles are respectively 3.5 cm and 7 cm,find the area of the shaded region in the figure.

In Fig 12,PS is a diameter of a circle whose radius is 6 cm.Two points Q and R are taken on PS such that PQ=QR=RS.Two semicircles are drawn with PQ and QS as their respective diameters as shown in the figure.Find the perimeter and the area of the shaded region shown in figure. (pi=3.14)

A wooden article was made by scooping out a hemisphere from each end of a solid cylinder,as shown in Fig.13.11.If the height of the cylinder is 10 cm,and its base is of radius 3.5. find the total surface area of the article.

In Fig.12.33.ABC is a quadrant of a circle of radius 20 cm and a semicircle is drawn with BC as diameter. Find the area of the shaded region.

A silver wire of 1 mm diameter has a charge of 90 coulombs flowing in 1 hours and 15 minutes. Silver contains 5.28*10^28 free electrons per cm^3. Find the current in the wire and drift velocity in the electron?