Heap of rice is in shape of cone, so
r=92m=4.5m
h=3.5m
∴V=13πr2h=13×227×92×92×3.5
⇒V=22×9×9×353×7×2×2×10=33×94=2974
⇒V=74.25m3
Hence, volume of rice = 74.25m3.
For canvas:
Area of canvas = Curved surface area of cone
=πrl
Here, l2=r2+h2=(4.5)2+(3.5)2=20.25+12.25
⇒l2=32.50
⇒l=√32.5=5.7m
∴ Area of canvas = 227×4.5×5.7=80.614
⇒ Area of canvas = 80.61m2.