Question

Define: i) concentric circle (ii) orthocenter (iii) Secant

Answer 1

Answer

Answer:1) Concentric circles are circles with a common center. The region between two concentric circles of different radii is called an annulus. Any two circles can be made concentric by inversion by picking the inversion center as one of the limiting points.

2) The orthocenter is the point where all the three altitudes of the triangle cut or intersect each other. Here, the altitude is the line drawn from the vertex of the triangle and is perpendicular to the opposite side.

3) A secant of a circle is a line that passes through the circle, intersecting it in exactly two points. Secants are usually lines, extending infinitely in both direction

Answer 2

Answer:

Concentric circles are circles with a common center. The region between two concentric circles of different radii is called an annulus. Any two circles can be made concentric by inversion by picking the inversion center as one of the limiting points.

Step-by-step explanation:

the common intersection of the three altitudes of a triangle or their extensions or of the several altitudes of a polyhedron provided these latter exist and meet in a point. orthocenter

the ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine.secant