Nih satu lagi bantuin yah

[tex]b. \\ lp \: \frac{1}{2} \: bola = \frac{1}{2} \times 4 \times \frac{22}{7} \times 7 \times 7 = 308 \\ s = \sqrt{ {7}^{2} + {24}^{2} } = \sqrt{625} = 25 \\ lp \: kerucut \: tanpa \: alas = \frac{22}{7} \times 7 \times 25 = 550 \\ lp = 308 + 550 = 858 \\ [/tex]
[tex]c. \\ lp \: \frac{1}{2} \: bola = \frac{1}{2} \times 4 \times 3.14 \times 4 \times 4 = 100.48 \\ lp \: tabung \: tanpa \: tutup = 3.14 \times 4 \times 4 + 2 \times 3.14 \times 4 \times 16 \\lp \: tabung = 50.24 + 200.96 = 251.2 \\ lp \: kerucut \: tanpa \: alas = 3.14 \times 4 \times 5 = 62.8 \\ lp = 100.48 + 251.2 + 62.8 = 414.48[/tex]
Maaf kalo salah, semoga membantu