Penjelasan dengan langkah-langkah:
26. B
3x - 22 + 2x + 7 = 180°
5x - 15 = 180°
•••••dibagi 5••••
x - 3 = 36
x = 3 + 36
x = 39
sudut CBD = 2x + 7
sudut CBD = 2(39) + 7
sudut CBD = 78 + 7
sudut CBD = 85°
27. C
x + 37 = 3x - 19
x - 3x = -37 - 19
-2x = - 56
x = -56/-2
x = 28°
28. D
AC = (12+15)/(15-12)
AC = 27/3
AC = 9
AD/12 = 12/(9+15)
AD = 144/24
AD = 6 cm
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Penjelasan dengan langkah-langkah:
26. B
3x - 22 + 2x + 7 = 180°
5x - 15 = 180°
•••••dibagi 5••••
x - 3 = 36
x = 3 + 36
x = 39
sudut CBD = 2x + 7
sudut CBD = 2(39) + 7
sudut CBD = 78 + 7
sudut CBD = 85°
27. C
x + 37 = 3x - 19
x - 3x = -37 - 19
-2x = - 56
x = -56/-2
x = 28°
28. D
AC = (12+15)/(15-12)
AC = 27/3
AC = 9
AD/12 = 12/(9+15)
AD = 144/24
AD = 6 cm