Help me find the answer please??

Dear student,
   I am giving solution for first three questions for remaining questions kindly ask in another thread 

a. Diameter of hole is 7 cm Radius of hole =72=3.5 cmheight of hole =5cm ( from figure )Curved surface area of hole =2πrh                                             =2x 227x3.5x5                                             =110 cm2                                       b. Total surface area of cuboid block= 2(lb+bh+hl)                                                        =2(15x10+10x5+5x15)                                                         =550 cm2c. Area of two circular bases =2(πr2)                                            =2(227x3.52) cm2                                            =77 cm2                                                                                                                 
Looking forward to hear from you soon
Regards

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