1 Answer

Sharrod · Answer 1 · 2021-02-11T02:09:38+0000

Answer:

A.

Explanation:

We know that the whole length of the circumference is
$2 \pi$ .

By given, we have
$HJR=(9)/(10) \pi$ , and
$HJ=81\°$ by definition of central angle.

That means

$HJR=HJ+RJ\\(9)/(10) \pi = 81\° +RJ\\ 162\°-81\°=RJ\\RJ=81\°$

Also,

$RHJ=360\° - RJ=360\° - 81\° =279\°$

Therefore, the measure of the arc RHJ is 279° which is equivalen to choice A.

$(31)/(20)\pi = (31)/(20) * 180\° = 279\°$