Question

practice set 1.1 answer of std 9​

Answer 1

Step-by-step explanation:

Diameter

=

35mm

∴ Circumference of circle

=

2×

π×

17.5=

110mm

= 2× π× r

i) The total length of the silver wire required

=Circumference of circle+

(5×

35)

=

110+

175

=285mm

(ii) The area of each sector of the brooch

=

10

Area of circle

=

10

π×17.5×17.5

=

4

385

mm