a)
Hình 29 ta có: \(\widehat {xOy} = {147^0};\widehat {yOz} = {33^0};\widehat {xOz} = {180^0}\)
Hình 30 ta có: \(\widehat{aAb}=133^{0}; \widehat{bAc}= 27^{0};\widehat{cAd}=20^{0}\)
\(\widehat{aAc}=160^{0}; \widehat{bAd}= 47^{0};\widehat{aAd}=180^{0}\).
b) Các cặp góc bù nhau ở hình 30 là:
\(\widehat{aAb}, \widehat{bAd}\) ( vì \(\widehat{aAb} + \widehat{bAd}\) \(= 133^0 + 47^0 = 180^0 \))
\(\widehat{aAc}, \widehat{cAd}\) (vì \(\widehat{aAc}+ \widehat{cAd}\) \(=160^0+20^0=180^0\))