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Verified answer
Kelas 7 MatematikaBab Garis dan Sudut
Sudut ABC + sudut CBD = 90°
5x - 5° + 70° = 90°
5x = 90° - 65°
x = 25°/5
x = 5°
Besar sudut ABC
= 5x - 5°
= 5 . 5 - 5°
= 20°
Atau
Sudut ABC
= 90° - sudut CBD
= 90° - 70°
= 20°