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junior college 2 | H2 Maths
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Hi im confused on how to do part (ii), help is much appreciated. Thank you!
Date Posted: 5 years ago
Views: 327
Find area of the segment of the circle.CD. This is done by finding the area of the sector CBD first, then subtracting the triangle CBD from it.
Then, subtract area of the segment from the area of the smaller circle to find your answer
Then, subtract area of the segment from the area of the smaller circle to find your answer
Do you have the answer? My ans is r^2
Yup I got r² too
Yes it is r^2! Thank you so much!
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Clue: Find green angle using trigonometry. Then find area of shaded red sector. Few more steps after that.
Date Posted:
5 years ago
Alternative way to find the green angle without using trigo :
Both triangle CBA and DBA are right angled isosceles triangles.
So angle CBA and angle DBA are just 45°
((180°- 90°)/2)
then, angle CBD is the sum of the two angles.
Both triangle CBA and DBA are right angled isosceles triangles.
So angle CBA and angle DBA are just 45°
((180°- 90°)/2)
then, angle CBD is the sum of the two angles.
Oh yes! That’s definitely the most efficient and recommended way
Looking at this question again, I realised that ∠CBD = 90° (angle in a semicircle)
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