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a. <KLM = 2 x <KLO = 2 x 41 = 82°
<KNM = 2 x <KNO = 2 x 32 = 64°
<LKO = 180 - (90 + 41) = 180 - 131 = 49°
<OKN = 180 - (32 + 90) = 180 - 122 = 58°
<LKN = <LKO + <OKN = 49 + 58 = 107°
b.
KM = 2 x KO = 2 x 3,5 = 7 cm
LN = LO + NO = 4 + 5,6 = 9,6 cm
Luas layang = 1/2 x KM x LN
= 1/2 x 7 x 9,6
= 33,6 cm2
Untuk nomer 15 maaf saya belum bisa ngerjain