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Dacha
Dacha

Secondary 4 chevron_right A Maths chevron_right Malaysia

Form 4 question about circles
I want the method how to do and the anawer

Date Posted: 1 year ago
Views: 90

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Muhd Ilman Fahmi
Muhd Ilman Fahmi's answer
42 answers (Tutor Details)
1st
Sorry about the arrangement.

In part a, you use the length of the arc formula, which is the ratio of the angle to the full circle angle (360 degrees or 2pi) and then multiply by the circumference. You should get the answer of the angle theta.

For part b, you use similar triangles, or in this case sectors. Since OAD and OBC share the same angle, and the lengths of both sides of the sectors respectively are equal, because it is the radius of a circle, both sectors are similar. By doing some arrangement of the ratios, you should get the arc length AD in terms of OA. You should be able to get the answer from there. Hope it helps.