Tolong no.27 dan 28 dikerjakan paki cara ya... soalnya besok dikumpulkan.

27
[tex]cb = {16}^{2} + {12}^{2} \\ = 256 + 144 \\ = \sqrt{400} \\ = 20 \\ \\ bd \: = cd - cb \\ = {25}^{2} - {20}^{2} \\ = 625 - 400 \\ = \sqrt{225} \\ = 15[/tex]