Eric Nicholas K's answer to stoopid's Secondary 3 A Maths Singapore question.
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Date Posted:
3 years ago
There is actually a logical leap in your first part.
'x-axis is a tangent to the circle' does not necessarily imply the y-coordinate has to be 13.
You'll have to include that :
① the circle lies fully above/below the x-axis,
②Justify that P since lies above the x-axis, the circle has to be above the x-axis in order to pass through it.
③ radius is 13 and since tangent is perpendicular to radius, centre of circle is 13 units directly above the x-axis.
'x-axis is a tangent to the circle' does not necessarily imply the y-coordinate has to be 13.
You'll have to include that :
① the circle lies fully above/below the x-axis,
②Justify that P since lies above the x-axis, the circle has to be above the x-axis in order to pass through it.
③ radius is 13 and since tangent is perpendicular to radius, centre of circle is 13 units directly above the x-axis.
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