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sudut ACD + sudut AEC + sudut BAE =
30° + 90° + 30° = 150°
no. 30. A
ΔQPR = sudut P + sudut Q + sudut R = 180°
= 5x° + 24x° + 7x = 180
= 36x = 180
x = 180 : 36
x = 5
maka sudut QPR = sudut P = 5x° = 5 x 5 = 25°
no. 31. C
ΔABD = 180° - (50° + 80°) = 180 - 130 = 50°
karena sudut ABD berpelurus dgn sudut CBD
maka sudut ABD + sudut CBD = 180°
jadi sudut CBD = 180 - 50 = 130°