No 4-7 pleaseee pakai cara ama jawaban

4)
r = 8 cm
s = 17 cm

t^2 = s^2 – r^2
t^2 = 17^2 – 8^2
t^2 = 289 – 64
t^2 = 225
t = V225
t = 15 cm

V = 1/3 × phi × r^2 × t
V = 1/3 × 3,14 × 8 × 8 × 15
V = 1004,8 cm^3

5)
d = 21 cm

L = 4 × 1/4 × phi × d^2
L = phi × d^2
L = 22/7 × 21 × 21
L = 1386 cm^2

6)
rb = rt = 5 cm
tt = 8 cm

Vb : Vt
= (4/3 × phi × r^3) : (phi × r^2 × t)
= (4/3 × r) : (t)
= (4/3 × 5) : 8
= 20/3 : 8
= 20 : 24
= 5 : 6

7)
banyak siswa = 26 siswa
rata – rata 26 siswa = 55
nilai seorang siswa = 80

rata – rata nilai ujian baru
= [(55 × 26) – 80]/(26 – 1)
= (1430 – 80)/25
= 1350/25
= 54