The diameters of two cones are equal. If their slant heights are in the ratio 5 : 4, find the ratio of their curved surfaces.
Diameters of two cones are equal
∴ Their radius are also equal i.e., `r_1=r_2`
Let the ratio of slant height be x
∴` l_1=5x and l_2=4x`
∴ Ratio of curved surface area =`C_1/C_2`
∴ Ratio of curved surface area = 5:4