Jawaban:
3.) C. 53°
4.) D. 27°
Penjelasan dengan langkah-langkah:
3.)
KL = ML
Maka, ∆KLM adalah segitiga sama kaki, dimana <LKM = <KML
Cara penyelesaian:
<LKM + <KML + <KLM = 180°
<KML + <KML + 74° = 180°
2 <KML = 180° – 74°
2 <KML = 106°
<KML = 106°/2
<KML = 53° (C)
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4.)
(2x + 1)° + (4x – 3)° + 104° = 180°
6x – 2 = 180° – 104°
6x = 76° + 2
6x = 78°
x = 78°/6
x = 13°
4x – 3 = 4(13) – 3
= 52 – 3
= 44°
<ACD = 76° – 44°
= 27° (D)
No. 3
= (180° - 74°) ÷ 2
= 106° ÷ 2
= 53° (C.)
No. 4
➢ Nilai x
2x + 1° + 4x - 3° = 180° - 104°
6x - 2° = 76°
6x = 76° + 2°
6x = 78°
x = 13°
➢ Besar Sudut ACD
= BAC
= 2x + 1°
= 2(13°) + 1°
= 26° + 1°
= 27° (D.)
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