Question

13. A jeweler wants to make a triangular pendant for a necklace using three pieces of wire. He

has two pieces of wire with lengths of 12 millimeters and 15 millimeters. Describe the possible
lengths for the third wire.

Answer 1

Diameter =35mm
∴ Circumference of circle
=2×π×r =2×π×17.5=110mm

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
2