BBC

Equation of altitudes and perpendicular bisectors

Now use the information you already have about finding the equation of a line and apply it to the dashed lines shown in these triangles. Remember, to find the equation of a line you need a point ...
BBC

Applying the properties of shapes to determine an angle

In the diagram below, AB is the chord of a circle with centre O. OM is perpendicular to AB (meet at a right angle). Look at triangles OAM and OBM. The hypotenuses (OA and OB) are the same, as they are ...
Indiatimes

Horizontal vs vertical lines: A simple student guide with easy diagrams and examples

Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.
JSTOR Daily

Shapes of Spectral Line Bisectors for Cool Stars

Publications of the Astronomical Society of the Pacific, Vol. 117, No. 833 (July 2005), pp. 711-720 (10 pages) ABSTRACT The shape of the line bisector for the prototype spectral line Fe i λ6253 was ...