Tolong dijawab yaaa...

Cari h dulu, pakai pitagoras.
H^2 = 8^2 + 6^2
= 64 + 36 = 100
H = akar 100 = 10

4. t. Segitiga (h) = √ 8²+6²=√ 64 + 36= √100 = 10
L.per.limas= L.alas + L.sisi tegak
= a² + 4(1/2.a.t)
=12²+ 4(1/2.12.10)
=144+4.60
=144+240
=384 cm²