In the cone radius is 4cm height is 3cm . find . (1) slant height (2) c.s.a (3) t> s > a (4) volume
class 9
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Answers
Step-by-step explanation:
Radius of cone (r) = 4 cm
Height of cone (h) = 3 cm
1) Slant height of cone (l) =√r²+h²
=√4²+3²
= √16+9
= √25
= 5 cm
2) Curved surface area of cone = πrl
= 22/7 × 4×5
= 440/7
= 62.85 cm²
3) Total surface area of cone = πr(l+r)
= 22/7×4(5+4)
= 22/7×4×9
= 792/7
= 113.14 cm²
4) Volume of cone = 1/3πr²h
= 1/3×22/7×4²×3
= 22/7×16
= 352/7
= 50.28 cm³