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  • (b) A triangle PQR, where PQ = 9 cm, QR = 12 cm and PR = 15 cm, is rotate about the side QR totrace out a cone. Find the volume and the total surface area of the cone.?

(b) A triangle PQR, where PQ = 9 cm, QR = 12 cm and PR = 15 cm, is rotate about the side QR totrace out a cone. Find the volume and the total surface area of the cone.?

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volume;of;cone=frac13pi r^2h\*total;surface;area;of;cone=pi r(r+l) \* Now;see;figure;we;have;a;cone;with;height,h(QR)=12;cm,;base;as ;radius,r(PR)=15;cm;and;slant;height,l(QP)=9;cm\* volume;of;cone=frac13 imes pi imes 15^2 imes 12= 2827.43;cm^3 \*total;surface;area;of;cone=pi imes 15 imes (15+9)=1130.97;cm^2

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Deependra Verma

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