Tegak lurus: Perbedaan antara revisi
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'''Serenjang''', '''tegak lurus''' atau '''perpendikular''' ({{lang-en|perpendicular}}), dalam [[geometri]] dasar, adalah hubungan antara dua garis lurus yang bertemu di sebuah [[sudut tegak]].
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Dua [[bidang (geometri)|bidang]] di angkasa dikatakan berserenjang jika [[sudut dihedral]] tempat kedua bidang bertemu berbentuk sudut tegak (90 derajat). Dalam [[matematika]], serenjang disebut dengan [[ortogonalitas]], dan umum digunakan, misalnya dalam [[sistem koordinat Kartesius]].
== Lihat juga ==
* [[Ortogonalitas]] (pada matematika)
* [[Paralel (geometri)]]
* [[Komponen serenjang]] (pada vektor)
== Catatan ==
{{reflist}}
== Referensi ==
* {{ citation | first1 = Nathan | last1 = Altshiller-Court | year = 1925 | lccn = 52-13504 | title = College Geometry: An Introduction to the Modern Geometry of the Triangle and the Circle | edition = 2nd | publisher = [[Barnes & Noble]] | location = New York }}
* {{ citation | first1 = David C. | last1 = Kay | year = 1969 | lccn = 69-12075 | title = College Geometry | publisher = [[Holt, Rinehart and Winston]] | location = New York }}
== Pranala luar ==
{{wiktionary}}
* [http://www.mathopenref.com/perpendicular.html Definition: perpendicular] With interactive animation
* [http://www.mathopenref.com/constbisectline.html How to draw a perpendicular bisector of a line with compass and straight edge] Animated demonstration
* [http://www.mathopenref.com/constperpendray.html How to draw a perpendicular at the endpoint of a ray with compass and straight edge] Animated demonstration
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