how to join 2 tangents perpendicular to each other
My brother recently told me about Geogebra and now im trying to learn how to use it.
I want to plot the locus of the intersection of 2 tangents to an ellipse, the tangents being perpendicular to each other.
The outcome will be a circle.
But I am having difficulty getting the 2 tangent to stick together at 90 degrees, when I move the tangent point around.
If i construct a perp. to one tangent , the line stays through that point and doesnt stay a tangent.
if i construct another tangent , I cant make it stick to the other at 90.
Can anyone help please.