(9) Total surface area(A)=88cm^2 Height - TopicsExpress

(9) Total surface area(A)=88cm^2 Height (H)=7cm i)A=2*pie*r*h+2*pie*r^2 A=2*pie*r(h+r) 88=2*22/7*r(7+r) 88=6.29*r(7+r) 7r+r^2=88/6.29 7r+r^2=14 r^2+7r-14=0 using almighty formular r=-7+_root(7^2-4*1*-14)/2 r=-7+_root(49+56)/2 =-7+_root(105)/2 =-7+_10.25/2 r=-7-10.2/2 or-7+10.25/2 r=-8.625 or 1.625 Diameter(d)=2r 2*1.625 =3.625 ii)Volume of the solid(v) =pie*r^2*h =22/7*(1.625)^2*7 =406.66/7 =58.09cm^3 b)=74degrees

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