Difference between revisions of "Equilateral triangle"
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| + | <asy> | ||
| + | pair A=(0,50),B=(43.301,-25),C=(-43.301,-25); | ||
| + | draw(A--B--C--A); | ||
| + | label("$60^{\circ}$",(-28,-16)); | ||
| + | draw(anglemark(B,C,A,300)); | ||
| + | label("$60^{\circ}$",(28,-16)); | ||
| + | draw(anglemark(A,B,C,300)); | ||
| + | label("$60^{\circ}$",(0,35)); | ||
| + | draw(anglemark(C,A,B,300)); | ||
| + | </asy> | ||
An '''equilateral triangle''' is a [[triangle]] in which all sides have equal length and all angles have equal measure. Since a triangle has a total of <math>180</math> degrees, each angle of an equilateral triangle has <math>60</math> degrees. | An '''equilateral triangle''' is a [[triangle]] in which all sides have equal length and all angles have equal measure. Since a triangle has a total of <math>180</math> degrees, each angle of an equilateral triangle has <math>60</math> degrees. | ||
Revision as of 10:38, 14 May 2018
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![[asy] pair A=(0,50),B=(43.301,-25),C=(-43.301,-25); draw(A--B--C--A); label("$60^{\circ}$",(-28,-16)); draw(anglemark(B,C,A,300)); label("$60^{\circ}$",(28,-16)); draw(anglemark(A,B,C,300)); label("$60^{\circ}$",(0,35)); draw(anglemark(C,A,B,300)); [/asy]](http://latex.artofproblemsolving.com/f/5/6/f56da6a9a5f35768610d03edcc49e679a9aaee48.png)
An equilateral triangle is a triangle in which all sides have equal length and all angles have equal measure. Since a triangle has a total of 
degrees, each angle of an equilateral triangle has 
degrees.
The equilateral triangle is the simplest regular polygon. It is also the only type of polygon that such that the equilateral polygon must also be the equiangular polygon.
One useful way to manipulate an equilateral triangle is to draw an altitude, which would divide it into two 30-60-90 right triangles. Using this, the area of an equilateral triangle can be found in terms of a side: 
.
