Mukati
convex quadrilateral - Ichi chimiro chejometri chinowanikwa nekubatanidza mapoinzi mana mundege isingafanirwe kurara pamutsetse mumwe wakatwasuka. Muchiitiko ichi, mativi akaumbwa nenzira iyi haafaniri kupindirana.
Area formula
Pamwe diagonals uye kona pakati pavo
Nzvimbo (S) yeconvex quadrilateral yakaenzana nesekondi imwe (hafu) yechigadzirwa chemadiagonals ayo uye sine yekona pakati pawo.
Pamativi mana (formula yaBrahmagupta)
Kuti ushandise chimiro, unoda kuziva urefu hwemativi ose emufananidzo. Zvinofanirawo kukwanisa kutsanangura denderedzwa rakatenderedza quadrilateral.
p - semi-perimeter, yakaverengerwa sezvinotevera:
Pamwe neradius yedenderedzwa rakanyorwa uye mativi
Kana denderedzwa rinogona kunyorwa mu quadrilateral, nzvimbo yaro inogona kuverengerwa uchishandisa formula:
S = p ⋅ r
r ndiyo radius yedenderedzwa.
Muenzaniso wedambudziko
Tsvaga nzvimbo ye convex quadrilateral kana diagonals iri 5 cm uye 9 cm uye kona iri pakati payo i30 °.
Sarudzo:
Isu tinotsiva kukosha u1bu2bunozivikanwa kwatiri mufomula uye tinotora: S u5d 9/30 * 11,25 cm * XNUMX cm * chivi XNUMX ° uXNUMXd XNUMX cm2.