    Sentence I Quantitative ;Aptitude: In .an  isosceles triangle ABC, AB,=.BC;-a cirelevis  drawn with AB‘ as ‘digmeter intersects BC.  at’ D; If BD = 3.cm then lengthy of CD?    Sentence 2:'G ig,the centroid of a triangle  ABC. AB=.7 ‘emyBC=-24 em’ and ‘ACs 25  ‘em lf. D is the mid point of AC, what is  the length of GD? =.