tolong di jawab pake cara jangan asal jawab ya jawaban nya harus 3 nya

materi=matematika
27.
[tex]luas \: segitiga = \frac{1}{2} \times a \times t \\ = \frac{1}{2} \times 12 \times 12 \\ = {72}cm^{2} [/tex]
[tex]luas \: persegi \: panjang = p \times l \\ = 12 \times 12 \\ = {144}cm^{2} [/tex]
[tex]luas \: gabungan = {72}cm^{2} + {144}cm^{2} \\ = {216}cm^{2} [/tex]
28.
[tex]luas \: permukaan = p \times l \times t \\ 13 \times 12 \times 10 \\ = {1560}cm^{2} [/tex]
29.
[tex]volume \: tabung = \pi \times r \times r \times t \\ = 3.14\times 15 \times 15 \times 21 \\ = {14836.5}cm^{3} [/tex]
30.
[tex]luas \: segitiga = \frac{1}{2} \times a \times t \\ = \frac{1}{2} \times 30 \times 24 \\ = {360}cm^{2} [/tex]
[tex]luas \: prisma \: segitiga = 2 \times \frac{1}{2} \times luas \: alas + keliling \: alas \times t \\ 360= 2 \times \frac{1}{2} \times 30 \times 24+ {30 + 24 + 18} \times t \\ 360 = 792 \times t \\ t = \frac{792}{ 360} \\ t = {2.2}cm^{2} [/tex]
maaf kalau salah karena gambarnya kurang jelas. semoga bermanfaat