Questions - 1
if a hemisphere is cut at a height of 21 cm from the center and thus the volume of the
figure obtained is 198 cm^3 then find the total surface area of the Hemisphere
figure obtained is 198 cm^3 then find the total surface area of the Hemisphere
का अायतन 198 सेमीं^3 हो तो अर्द्धगोले का कुल पृष्ठीय क्षेत्रफल बताअो।
(A) 150π (B) 273π
(C) 250π (D) 450π
Solution - (D)
Let radius of hemisphere is r cm.
Volume of figure after cutting =
➡ 1/3πh( 3r^2 - h^2 ) = 198
➡ 1/3x 22/7x 21 ( 3r^2 - h^2 )
r = 5√6
TSA of hemisphere = 3πr^2
= 3π ( 5√6 )^2
= 450π
Questions - 2
Radius of a solid hemisphere is r cm. Cut the cube of maximum side from this
hemisphere and the side of cube is 6√2 cm. Find the volume of waste material.
किसी r त्रिज्या वाले ठोस अर्द्धगोले में से को एक 6√2 सेमीं भुजा ( अधिकतम ) वाले घन को
काटकर निकाला जाता हैं। तो व्यर्थ हुए भाग का अायतन ज्ञात करो।
Sir aap jaisa koi bhi itna deeply nhi pada sakta thanks sir
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