8th Class Mathematics Menstruation Question Bank Mensuration

  • question_answer DIRECTIONS: Read the following passages and answer the questions that follow. PASSAGE - 2 Area of the path enclosed between two concentric circles of radii R, r is \[1420c{{m}^{2}}\] and area of sector of a circle with sector angle \[1410c{{m}^{2}}\][r = radius of the circle] A group of workers engaged in plastering a wall completed half of the work on one day and quarter of the remaining in next day if still 45 sq mt. of the wall remained to be plastered, find the area of the wall.

    A) 120 sq.cm                   

    B) 90 sq. m          

    C) 120 sq. m       

    D) 90 sq.cm

    Correct Answer: C

    Solution :

    \[150c{{m}^{2}}\] \[30\sqrt{7}cm\] \[\therefore \] Total area of the wall \[=\frac{45\times 8}{3}=\frac{360}{3}=120sq.m.\]     

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