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secondary 4 | A Maths
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jeno
Jeno

secondary 4 chevron_right A Maths chevron_right Singapore

need help for ii and iii

Date Posted: 8 months ago
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Eric Nicholas K
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3837 answers (Tutor Details)
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Given answer for (iii) is clearly incorrect.
Eric Nicholas K
Eric Nicholas K
8 months ago
The radius formed by (5, 8) and (12, 8) is a vertical line.

So, the chord must be horizontal with a fixed value of y = 12.

So the points of intersection are (a, 12) and (b, 12). We proceed to use Pythagoras Theorem to find the horizontal distance from (12, 8) to the circle.