Qardhaas

Qardhaas Waa mid kamid ah joometeriya afar xagal leh, afartiisa dhinacna ay isla egyihiiin, waxa uuna u egyahay laba saddax-xagal oo kala jeeda oo hal sal ka dhaxeeya Template:Infobox Polygon

Bedka

Bedka ama Badka Qardhaas waxaa loo xisaabi karaa afar qaab:

1. Barbaroolayaasha oo dhan, Waxa ay ka samaysmaan Salka $a$, Waxa ay la jaan qaadeeysaa dhinacyada iyo jooga $h$:

   $A=a\cdot h,$

2. Adigoo dhexroorka dheer ku dhifta $d_1$ Dhexroorka gaaban $d_2$ Oo aad markaas uqaybiso

   $\frac{\overline{AC}\cdot \overline{SB}}{2}=\frac{\overline{AC}\cdot \overline{BD}/2}{2}=\frac{\overline{AC}\cdot \overline{BD}}{4}$

   Adigoo laba laaba si aan u helno

   $A=\frac{d_1\cdot d_2}{2}=\frac{\overline{AC}\cdot \overline{BD}}{2},$

3. Adigoo ku dhufanaya goobada $p$ Gacanka $r$ Wareegeeda

   $4\cdot \frac{a\cdot r}{2}=2\cdot a\cdot r=p\cdot r$.

   $A=p\cdot r,$

4. Ugudamayntii adigoo uxisaaba sida afar xafal $a$ Xaglaha gudaha adigoo isku dhufta

   $a^2\cdot \sin \alpha =a\cdot (a\cdot \sin \alpha )=a\cdot h$

   $A=a^2\cdot \sin \alpha =a^2\cdot \sin \beta .$