Question

tolong jawab pertanyaan pada gambar! cepat besok dikumpulkan!​

Answer 1

Verified answer

Jawaban:

9 cm

Penjelasan dengan langkah-langkah:

Lp = 3.960 cm²

r = 21 cm

Lp = 2 x π x r(r + t)

3.960 = 2 x 22/7 x 21(21 + t)

3.960 = 2 x 22 x 3(21 + t)

3.960 = 132(21 + t)

3.960 = 2.772 + 132t

132t = 3.960 - 2.772

132t = 1.188

t = 1.188 : 132

t = 9 cm