△ABC∽△A′B′C′,如果∠A=55°,∠B=100°,则∠C′的度数等于( )
A.55°
B.100°
C.25°
D.30°
∵∠A+∠B+∠C=180°,∴∠C=180°-55°-100°=25°,
又∵△ABC∽△A′B′C′,
∴∠C′=∠C=25°.
故选C.
△ABC∽△A′B′C′,如果∠A=55°,∠B=100°,则∠C′的度数等于( )
A.55°
B.100°
C.25°
D.30°
∵∠A+∠B+∠C=180°,∴∠C=180°-55°-100°=25°,
又∵△ABC∽△A′B′C′,
∴∠C′=∠C=25°.
故选C.