Question

plz solve this problem for me . by seeing this question is easy but I can't solve this
one thing answer is a.285mm b.385mm

Answer 1

(a) length of wire = circumference
Circumference =
$2\pi \: r$
2*22/7*35/2
=2*22*5/2
=220/2
=110 mm
Wire used in diameter =35*5 (no. Of diameter 5
=175mm
Total wire used =110+175
=285mm

(b) area of each sector = 1/10 *area of 10 sectors
Area of 10 sectors =
$\pi \: {r}^{2}$
=22/7*35/2*35/2
=11*5*35/2
Area of each sector =1/10*11*5*35/2
=385/4 mm2