Respuesta :

lambuhere

Answer:

if ∠ABC = 180°,

then, 2x∠ADC = ∠ABC ( angles subtended by an arc at the center is double the angle subtended it at any point on the remaining part if the circle)

{ please read the theorem carefully as i know u wont be able to understand it at first try :) }

therefore ∠ADC = 90°

Manetho

Answer:

90°

Step-by-step explanation:

if ∠ABC = 180°,

then, 2 x∠ADC = ∠ABC

we know that angles subtended by an arc at the center is double the angle subtended by the same arc at any point on the circumference of the circle

therefore ∠ADC =90°

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