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I Honestly dont understand all of these that have to do with right angles, tangent lines, and secant lines. can i please get some help.

I Honestly dont understand all of these that have to do with right angles tangent lines and secant lines can i please get some help class=

Respuesta :

Answer:

110°

Step-by-step explanation:

m arc DB=140°

m arc BCD=360-140=220°

∠ A=1/2×220=110°   (∵angle at the circumference=1/2 angle at the center.)

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