![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=35066089bc3a8e68192ca1af313e4898.png\")
miles.\
Length of the arc is miles.
Angle ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f9fb1e8b112b1a74bde28c9a901a908f.png\")
.
Convert the angle from degrees to radians :
\![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b64654d6344ad90f97405691eba0a040.png\")
radians.
Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8d0b283af298862d4c58db194a4bc073.png\")
in ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=35066089bc3a8e68192ca1af313e4898.png\")
.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=56c3cee8a9eb511ab9e3bf662b83176d.png\")
The radius of the Earth is 3979 miles.
\\
Now we have to find the circumference of the Earth.
\circumference of the Earth is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0bdd4afab06122c5f092b0e31d384681.png\")
.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=dd74a7c12ef0c701780ce9deb8efed55.png\")
The circumference of the Earth is 25000 miles.
\\
The radius of the Earth is 3979 miles.
\The circumference of the Earth is 25000 miles.