tolong jawab ini plisss besok harus dikumpul sebelum upacara

a)
[tex]( \frac{13 \times 2}{2} ) \times 10 = 130 {cm}^{2} [/tex]
b)
[tex]6 \times 5 \times 13 = 390 {cm}^{2} [/tex]
c)
[tex]( \frac{(8 + 15) \times 10}{2} ) \times 20 \\ = (23 \times 5) \times 20 \\ = 2300 {cm}^{2} [/tex]

a) 1/2 x a x t x T =1/2 x 2 x 13 x 10 = 130 cm²
b) p x l x t = 6 x 5 x 13 = 390 cm²
c) 1/2(a+b) txT = 1/2 x (15+8) 10 x20 = 2300cm²