Tolong bantu kak besok kumpul​

Penjelasan dengan langkah-langkah:

1) a. K = 2 x (13+9) = 2 x 22 = 44 cm

b. L = 13 x 9 = 90 + 27 = 117 cm²

2) a. K = 4 x 8,5 = 34 cm

b. L = (8,5)² = (1+8)(8),(5×5) = 72,25 cm²

3) a. K = 2(10+8) = 2 x 18 = 36 cm

b. L = 10 x 12 = 100 + 20 = 120 cm²

4) 18(2x + 3) = 2(81)

9(2x + 3) = 81

2x + 3 = 81/9

2x = 9 – 3

x = 6/2

x = 3

d2 = 2(3) + 3 = 9 cm

5) d2 = 375 x 2/50 = 375/25 = 15 cm