AskQ logo

STUCK ON HOMEWORK?

ASK FOR HELP FROM OUR KIASUPARENTS.COM COMMUNITY!

Question

Answer

(i) FG = 10 sin(π/3) cm = 8.66 cm

(ii) ∠EOC = π – 2π/3 = π/3

arc length EOC = (π/3) 2π * 10 / 2π cm = 10.47 cm

1 Reply 2 Likes ✔Accepted Answer

Hi waterflow,

thank you for replying and your help.

From your workings, i understand part (ii). I believe it’s from the formula S=rθ

 what I can’t understand is part (i). Why is the length FG = 10 sin θ ?

 Is that from a formula as well?

1 Reply 1 Like

Dear altp10,

OE = OG = radius of the circle = 10 cm.

OE sin(π/3) thus equal to the breadth of the rectangle.  Hope this is clear. 

1 Reply 2 Likes

Ok. Understand.. thank you very much 🙏🏻 

0 Replies 1 Like