Question

One Mark Questions.
1) The radius of the base and slant height of a cone are 21 cm and 35 cm respectively
Find the height of the cone.
2) Write the formula to calculate the curved surface area of the frustum of a cone.
N (R+r)lsq. units
3) A solid piece of iron is in the form of a cuboid of dimensions
10 cm x 5cm x 2cm Find its volume .
4) Write the formula to calculate the CSA of the hemisphere
Surface area of the hemisphere = 21tr2
5) Write the formula to calculate the VOLUME of the frustum of a cone .
ah
[R2 + y2 + Rr ]cm3
3.
V =
Pa
ನಿರ್ದೇಶಕರ ಕಛೇರಿ, ಬೆಂಗಳೂರ ದಕ್ಷಿಣಜಿಲ್ಲೆ​

Answer 1

Given, Base radius of cone (r) = 21 cm

Slant Height of cone (l) = 35 cm

Total surface area = πr(l + r)

227227 × 21 × (35 + 21) = 22 × 3 × 56

= 3696 cm2