Bonjour,
IB = 8/2 => 4cm = AI
SI:
Pythagore
AS² = AI²+IS²
AS² - AI² = IS²
9² -4²
= 81-16
= 65
IS² = 65
IS =√65
IS≈ 8,06cm
Volume:
(aire base *h)/3
(3,14 * 4² * 8,06) /3
=> 134, 98cm ³
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Bonjour,
IB = 8/2 => 4cm = AI
SI:
Pythagore
AS² = AI²+IS²
AS² - AI² = IS²
9² -4²
= 81-16
= 65
IS² = 65
IS =√65
IS≈ 8,06cm
Volume:
(aire base *h)/3
(3,14 * 4² * 8,06) /3
=> 134, 98cm ³