Tangents : Equation of a tangent to a Circle : ExamSolutions

In this video you are shown how to find the equation of a tangent to a circle. To see the maths revision guide on this go to ExamSolutions at http://www.examsolutions.co.uk/

Category:

Education

Tags:

• math
• coordinate
• geometry
• equation
• circle
• tangent
• ExamSolutions
• Exam Solutions

[lpspgameplay]

ah.

I understand everything. Just one tiny thing im extremely confused about.

Is when getting the gradient of something, i always always mix up and am confused about which one is the tangent gradent, which one is the normal gradient.

[ExamSolutions]

@lpspgameplay The normal gradient goes from the centre to the circumference and the tangent is the perpendicular to this.

[lpspgameplay]

@ExamSolutions i see, so first we get the normal gradient and then perpendicular to get the tangent at circles.

And In C1 when we do dy/dx of any equation to get the line, is the gradient of the tangent always what we get first? and only then perpendicular for the normal line?

[ExamSolutions]

@lpspgameplay Yes

[SulthanaB226]

you sir, are giving me this A in C1.

[ExamSolutions]

@SulthanaB226 Keep working hard and hopefully you will get it.

[SulthanaB226]

@ExamSolutions hopefully! it doesn't help that its so hard! I'm struggling with C1 and its just an 'introduction to advanced mathematics'

[rfly12321]

yess thank you

[cheesypeesy2]

To find the centre I just use (-g,-f), with g being the number in front of the x and f being the number in front of the y.

[Brianyoutubation]

I will in my boots!