Question

What is m? 49° 77° 98° 161°

Answer 1

we know that

The measurement of the external angle is the semi-difference of the arcs it includes.

In this problem

$21\°=\frac{1}{2}[arc\ RU-arc\ SU]$

Solve for the measure of arc SU

$42\°=[arc\ RU-arc\ SU]$

$arc\ SU=arc\ RU-42\°$

$arc\ SU=119\°-42\°=77\°$

therefore

the answer is

The measure of the arc SU is $77\°$

Answer 2

Answer:

77

Step-by-step explanation: