Jawabanmu

2014-03-23T12:38:44+07:00
Berpelurus = 180 derajat.
2/5 B + B = 180
7/5 B = 180
B = 180 x 5 : 7
B = 900/7
B = 128,6 (hasil pembulatan)
A = 2/5 B = 2/5 x 128,6 = 51,44

berpenyiku = 90 derajat
2/5 B + B = 90
7/5 B = 90
B = 90 x 5 : 7
B = 450/7
B = 64,3 (hasil pembulatan)
A = 2/5 x 64,3 = 25,72
selisihnya = 64,3 - 25,72 = 38,58

maaf kalau salah..
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