Eaghtyr

She yn mooad towse-oaylleeagh bun-chooish y duillag shoh. My vel anaase ayd ayns keeal elley yn 'ockle shoh, lhaih Eaghtyr (reddaghey).

Ta'n fockle eaghtyr ny chur sheese er mooad ta fockley mooadys daa-howshanagh er rheynn vaghtal jeh baare, eaghtyr ny crackan, ta caglit liorish cruill ghooint. Ta'n enmys ny chur sheese er slane eaghtyr baare, eaghtyr ny crackan anchoodit jeh stooalt tree-howshanagh, lheid as sym eaghtyryn jeh çheughyn anchoodit polyheedrane.

Unnidyn

Ta unnidyn ry hoi towshanagh eaghtyr goaill stiagh lheid as:

are (a) = 100 meteryn kerrinagh (m²)

hectare (ha) = 100 areyn (a) = 10000 meteryn kerrinagh (m²)

kilometer kerrinagh (km²) = 100 hectareyn (ha) = 10000 areyn (a) = 1000000 meteryn kerrinagh (m²)

mooar-veter kerrinagh (Mm²) = 10¹² meteryn kerrinagh

trie cherrinagh = 144 oarlee cherrinagh = 0.09290304 meteryn kerrinagh (m²)

stundayrt kerrinagh = 9 trieyn kerrinagh (0.84 m²) = 0.83612736 meteryn kerrinagh (m²)

perçh kerrinagh = 30.25 stundayrtyn kerrinagh = 25.2928526 meteryn kerrinagh (m²)

meeilley cherrinagh = 640 acyryn (2.6 km²) = 2.5899881103 kilometeryn kerrinagh (km²)

Formley

Formley cadjin da eaghtyr:

Cummey	Cormid	Ceaghlee
Kerrin	$s^{2}\,\!$	She $s$ lhiurid un çheu y cherrin.
Troorane cadjin (troorane co-lhiatteeagh)	${\frac {\sqrt {3}}{4}}s^{2}\,\!$	She $s$ lhiurid un çheu y troorane.
Shey-lhiattaghan cadjin	${\frac {3{\sqrt {3}}}{2}}s^{2}\,\!$	She $s$ lhiurid un çheu y shey-lhiattaghan.
Hoght-lhiatteeane cadjin	$2\left(1+{\sqrt {2}}\right)s^{2}\,\!$	She $s$ lhurid un çheu y hoght-lhiatteeane.
Yl-lhiatteeane cadjin erbee	${\frac {1}{2}}ap\,\!$	She $a$ yn apothem, ny craue raadeeoil jeh kiarkyl grainnit 'syn yl-lhiatteeane, as she $p$ ym-linney yn yl-lhiatteeane.
Yl-lhiatteeane cadjin erbee	${\frac {ns^{2}}{4\cdot \tan(\pi /n)}}\,\!$	She $s$ y çheu-lhiurid as she $n$ earroo ny çheughyn.
Yl-lhiatteeane erbee (jannoo ymmyd jeh towse keim)	${\frac {ns^{2}}{4\cdot \tan(180^{\circ }/n)}}\,\!$	She $s$ y çheu-lhiurid as she $n$ earroo ny çheughyn.
Kiare-chuilleig	$lw\,\!$	She $l$ as $w$ lhiuridyn jeh çheughyn ny kiare-chuilleig (lhiurid as lheead).
Coheeyntane (dy cadjin)	$bh\,\!$	She $b$ as $h$ lhiurid y vun as lhiurid yn yrjid jeeraghan, er lheh.
Rhombus	${\frac {1}{2}}ab$	She $a$ as $b$ lhiuridyn daa hessen y rhombus.
Troorane	${\frac {1}{2}}bh\,\!$	She $b$ as $h$ bun as yrjid (towsit ayns jeeraghan rish y vun), er lheh.
Troorane	${\frac {1}{2}}ab\sin(C)\,\!$	She $a$ as $b$ daa çheu erbee, as she $C$ yn uillin eddyr oc.
Kiarkyl	$\pi r^{2}\ {\text{ny}}\ {\frac {\pi d^{2}}{4}}\,\!$	She $r$ y chraue raadeeoil as she $d$ y crantessen.
Eelips	$\pi ab\,\!$	She $a$ as $b$ ny h-essylyssyn lieh-vooar as lieh-veg, er mod.
Far-voayrdeen	${\frac {1}{2}}(a+b)h\,\!$	She $a$ as $b$ ny çheughyn coheeynt as she $h$ y foddeeaght (yrjid) eddyr ny colinnaghyn.
Slane eaghtyr y Rollian	$2\pi r^{2}+2\pi rh\,\!$	She $r$ as $h$ y chraue raadeeoil as yn yrjid, er mod.
Eaghtyr lhiattagh y rollian	$2\pi rh\,\!$	She $r$ as $h$ y chraue raadeeoil as yn yrjid, er mod.
Slane eaghtyr y chughlin	$\pi r(l+r)\,\!$	She $r$ as $l$ y chraue raadeeoil as yn yrjid sceau, er mod.
Eaghtyr lhiattagh y chughlin.	$\pi rl\,\!$	She $r$ as $l$ y chraue raadeeoil as yn yrjid sceau, er mod.
Slane eaghtyr ny cruinney	$4\pi r^{2}\ {\text{ny}}\ \pi d^{2}\,\!$	She $r$ and $d$ are the radius and diameter, respectively.
Slane eaghtyr yn eelipsoyd		Jeeagh er yn art.
Rheynnag chiarkylagh	${\frac {1}{2}}r^{2}\theta \,\!$	She $r$ as $\theta$ y chraue raadeeoil as yn uillin (ayns raadjanyn), er mod.
Çhyndaays eaghtyr kerrinagh dys eaghtyr kiarkylagh	${\frac {4}{\pi }}A\,\!$	She $A$ eaghtyr y cherrin ayns unnidyn kerrinagh.
Çhyndaays eaghtyr kiarkylagh dys eaghtyr kerrinagh	${\frac {1}{4}}C\pi \,\!$	She $C$ eaghtyr y chiarkyl ayns unnidyn kiarkylagh.

Ta ny calghoolyssyn shoh heose taishbyney c'red eaghtyr ram cummaghyn cadjin y gheddyn.