vivi297
24.08.2019 •
Mathematics
Given: dr tangent to circle o.
if m _ rdc = 120°, then m dac =
•60
•120
•240
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Ответ:
The measure of the arc DAC is 240°
Step-by-step explanation:
we know that
The semi-inscribed angle is half that of the arc it comprises.
so
m∠RDC=(1/2)[arc DAC]
we have
m∠RDC=120°
substitute
120°=(1/2)[arc DAC]
240°=[arc DAC]
Rewrite
arc DAC=240°
Ответ:
Option C.
Step-by-step explanation:
If a tangent and arc intersect at a point on a circle the measure of angle formed by the intersection will be half of the arc intercepted.
Therefore, m∠RDC =
Since m∠RDC = 120°
120 =
m(arcDAC) = 2×120°
m(arcDAC) = 240°
Option C. 240° is the answer.
Ответ: