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junior college 2 | H3 Maths
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help me~~~~~~
Date Posted: 6 years ago
Views: 485
Find the length of P to the centre of the circle first. You have the coordinates of both to do so.
The length from the centre to the tangent point = radius = 4
The tangent is perpendicular to the normal of the circle (line drawn across the circle, through the centre and the tangent point).
Angle between tangent and the normal is 90°. So when you connect P to the centre and to the tangent point, you get a right angled triangle. Use Pythagoras' Theorem
to find the answer
The length from the centre to the tangent point = radius = 4
The tangent is perpendicular to the normal of the circle (line drawn across the circle, through the centre and the tangent point).
Angle between tangent and the normal is 90°. So when you connect P to the centre and to the tangent point, you get a right angled triangle. Use Pythagoras' Theorem
to find the answer
I got it!! Thanks a lot.
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