tentukan nilai a pada setiap gambar dibawah ini.

GAMBAR 1
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➡Sudut Siku - siku = 90°

Maka,
2a + 3a = 90°

5a = 90°

a = 90°/5

a = 18°✔



GAMBAR 2
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➡Sudut Garis Lurus = 180°

Maka,

46° + a + 29° + 5a + 15° = 180°

6a + 90° = 180°

6a = 180° - 90°

6a = 90°

a = 90°/6

a = 15° ✔