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b.13cm
c.110°
4.a.120
b.40
c.100
d.100
b.panjang CD= AD= 13 cm
c.besar BCD=BAD =110derajat
4.
a.besar LKN = 2 x NKM = 120 derajat
b.besar LMN =2 x NMK = 40 derajat
c.besar KLM = KLM - LKM - LMK =180
=KLM - 60 - 20 = 180
=KLM =180 - 100 = 80 derajat
d.besar KNM=KLM 80 derajat
5 digambar maaf tidak bisa gambar disini/ tidaktau caranya gambar disini