vhetha
4) d = 8 cm r = 4 cm t = 15 cm phi = 3,14 a) Ls = phi × r(r + t) = 3,14 × 4(4 + 15) = 3,14 × 76 = 238,64 cm² b) Ls = phi × d × t = 3,14 × 8 × 15 = 376,8 cm²
5) Ls = 528 cm² t = 12 cm phi = 22/7 Ls = phi × r(r + t) 525 = 22/7 × r(r + 12) (525 × 7) = 22r × (r + 12) 3675 = 22r² + 264 r² = (3675 - 264) ÷ 22 r = √ 155 r = 12,4 cm
r = 4 cm
t = 15 cm
phi = 3,14
a) Ls = phi × r(r + t)
= 3,14 × 4(4 + 15)
= 3,14 × 76
= 238,64 cm²
b) Ls = phi × d × t
= 3,14 × 8 × 15
= 376,8 cm²
5) Ls = 528 cm²
t = 12 cm
phi = 22/7
Ls = phi × r(r + t)
525 = 22/7 × r(r + 12)
(525 × 7) = 22r × (r + 12)
3675 = 22r² + 264
r² = (3675 - 264) ÷ 22
r = √ 155
r = 12,4 cm