the total surface area of a right circular of slant height 13 cm is 90π cm square calculate it's radius
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TSA of cone= πr [ l+r ]
90π= πr [13+r]
90=13r+r²
r²+13r-90=0
r²+18r-5r-90=0
r[r+18]-5[r+18]=0
r=5 , -18 [ rejected ]
r=5
90π= πr [13+r]
90=13r+r²
r²+13r-90=0
r²+18r-5r-90=0
r[r+18]-5[r+18]=0
r=5 , -18 [ rejected ]
r=5
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