Question

व्हाट विल बी द कॉस्ट ऑफ़ कारपेट एसक्यूएम रूपीस फिफ्टी​

Answer 1

Diameter of cone = 40 cm

Radius of cone = 20 cm = m = 0.2 m

Height of cone = 1 m

Slant height of cone

= = = m = 1.02 m

Curved surface area of cone = = 3.14 x 0.2 x 1.02 = 0.64056 m2

Cost of painting 1 m2 of a cone = Rs. 12

Cost of painting 0.64056 m2 of a cone = 12 x 0.64056= Rs. 7.68672

Cost of painting of 50 such cones = 50 x 7.68672 = Rs. 384.34 (approx.)