[br][br]एका वर्गखोलीतील आयताकृती फरशीची लांबी 54 सेमी व रुंदी 45 सेमी आहे.  त्या वर्गखोलीचे क्षेत्रफळ[br]14.58 चौमी आहे तर त्या वर्गखोलीकरिता त्याच आकाराच्या किती फरशा लागतील ?[br][br]उत्तर :[br][br][br]फरशीची लांबी = [i]l[/i] = 54 सेंमी = 0.54 मीटर[br][br][br]            फरशीची रुंदी  = [i]l[/i] = 45 सेमी =[br]0.45 मीटर[br][br][br]                              एका फरशीचे क्षेत्रफळ  =  लांबी x रुंदी[br][br][br]                                                                  =          0.54     x          0.45[br][br][br]                                                                  =          0.243 मी2[br][br][br]लागणाऱ्या एकूण फरशा          =          [br]                                                                           [br][br]                                                            =          [br] [br]                                                                 =          60        [br][br][br]\  लागणाऱ्या  फरशांची संख्या 60. असेल[br][br][br]

[br][br]अशोक चक्रातील दोन आऱ्यांमधील वर्तुळकंसाचे माप किती?[br][br][br]उत्तर :                    वर्तुळकंसाचे माप   =   [br] [br]                =  15[sup]0[/sup].[br][br][br]

[br][br]3.   एका आरशासाठीच्या काचेची लांबी 4 फूट व रुंदी 1 फूट आहे. काचेच्या चारही कोपऱ्यात [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br][br] [br]   फूट त्रिज्या घेऊन A, B, C, D या बिंदूतून कंस काढून काच कापली आहे. तर काचेच्या एका (मागील) बाजूस पारा लावण्यासाठी प्रति चौ. फूट 20 रुपये दराने किती खर्च येईल?[br][br][br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br] [br][br] [br] [br] [br] [table] [tr] [td][br] [br] [b]F[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]L[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]K[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]I[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]J[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]E[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]G[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]FH[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]A[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]B[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]D[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]C[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] [br] [br] [br] [br] [br] [br] [br] [table] [tr] [td][br] [br] [b]G[/b][br][br] [br][br] [/td] [/tr][/table][br] [br] उत्तर:[br][br]A(EFGH)     [br]=         EH       x  GH[br][br][br]                        =          1          x  3.5   [br][br][br]                        =          3.5        चौ.फूट[br][br][br]A(LABK)     [br]=         AB      x AL[br][br][br]                        =          0.5       x[br]0.25  [br][br][br]                        =          0.125        चौ.फूट[br][br][br]A( IDCJ )      =          0.125        चौ.फूट[br][br][br]कोपऱ्यातील एका [br][br][br]भागाचे क्षेत्रफळ           =          [br] [br]      x       pr[sup]2[/sup]. [br][br][br]                              =      [br] [br]    [br][br][br]                              =      [br] [br]     [br][br][br]                             =       [br] [br][br][br][br]                                    =          0.049 चौ.फूट[br][br][br]चार भागांचे क्षेत्रफळ    =          4 [br]x  0.049[br][br][br]                                    =          0.196 चौ.फूट[br][br][br]किंवा [br][br][br]4 भागांचे मिळून एका [br][br][br]वर्तुळाचे क्षेत्रफळ     =          [br] [br][br][br][br]                                           =       [br] [br] [br][br][br]=       [br] [br]                                           [br][br][br]                                                =          0.196 चौ.फूट[br][br][br]एकूण क्षेत्रफळ                         =          A(EFGH) +  A(LABK) + [br]A(DCJI) [br][br][br]+ चारही कोपऱ्यांचे क्षेत्रफळ[br][br][br]                                                =          3.5[br]+ 0.125 + 0.125 + 0.196[br][br][br]                                                =          3.946 चौ.फूट[br][br][br]पारा लावण्याचा खर्च    =          3.946[br]  x          20[br][br][br]                                                =          78.92 रुपये[br][br][br]                                                »          79 रुपये (अंदाजे)[br][br][br]