Bonjour;
1)
Pythagore
SA² = HA² + SH²
4² + 7²
= 16 +49
= 65
SA = √65
SA = 8,06 cm
2)
volume:
( aire base *h)/3
(3,14*4²)/3
= 16, 746 cm³ = = 16,7cm³
