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等于 ( ) A.60° 45° 120° 30°
︰∠ ︰∠ =3︰4︰5,则∠C.等于( ) A.45° B.60° C.75° 90°
45° 48° 50° 60°
等于 ( ) A. 60° 45° 120° 30°
30°或60° 45°或60° 120°或60° 30°或150°
=50°,BD∥AC,则∠CBD等于( ) A.40° 50° 45° 60°
:∠ :∠ =3:4:5,则∠C.等于( ) A.45°B.60°C.75° 90°
=60°,a=4,b=4,则 等于( ) A.45°或135°B.135° 45° 以上答案都不对
等于( ) A. 120° 60° 45° 30°
:∠ :∠ =3:4:5,则∠C.等于( ) A.45°B.60°C.75° 90°
=60°,a=4,b=4,则B等于( ) A.45°或135° 135° 45° 以上答案都不对
=45°,则 等于( ) A.45° B.30° 60° 30°或150°
30°或60° 45°或60° 120°或60° 30°或150°
∶∠ ∶∠ =3∶4∶5,则∠C.等于( ) A.45°B.60°C.75° 90°