Triangle Wikipedia

Triangle wave - Wikipedia.

A triangular wave or triangle wave is a non-sinusoidal waveform named for its triangular shape. It is a periodic, piecewise linear, continuous real function.. Like a square wave, the triangle wave contains only odd harmonics.However, the higher harmonics roll off much faster than in a square wave (proportional to the inverse square of the harmonic number as opposed to just the inverse)..

https://www.bing.com/ck/a?!&&p=07c3047bb5fbc67bJmltdHM9MTY2MDc1MzM5OSZpZ3VpZD01MGE3OWYxZi0xMDI0LTQ4ZDUtYTUzZC1mN2UwYmY3NTViNzQmaW5zaWQ9NTA5NQ&ptn=3&hsh=3&fclid=e7ce1c4e-1e48-11ed-86f2-6c63b4c8bb1d&u=a1aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvVHJpYW5nbGVfd2F2ZQ&ntb=1.

Altitude (triangle) - Wikipedia.

In geometry, an altitude of a triangle is a line segment through a vertex and perpendicular to (i.e., forming a right angle with) a line containing the base (the side opposite the vertex). This line containing the opposite side is called the extended base of the altitude. The intersection of the extended base and the altitude is called the foot of the altitude..

https://www.bing.com/ck/a?!&&p=b45ca8767378f93dJmltdHM9MTY2MDc1MzM5OSZpZ3VpZD01MGE3OWYxZi0xMDI0LTQ4ZDUtYTUzZC1mN2UwYmY3NTViNzQmaW5zaWQ9NTExNA&ptn=3&hsh=3&fclid=e7ce3c53-1e48-11ed-9aa8-d60f698fb61e&u=a1aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvQWx0aXR1ZGVfKHRyaWFuZ2xlKQ&ntb=1.