The measure angle RST is 99 degrees.
To find measure angle RST.
What is angle?
In Plane Geometry, a figure which is formed by two rays or lines that shares a common endpoint is called an angle and corner whether constituting a projecting part or a partially enclosed space.
Given that:
SU is angle bisector of <RST. So it can divide into 2 parts.
Measure angle RST= measure angle RSU+ measure angle UST
Measure angle RST=81+18
Measure angle RST=99 degrees
So, the measure angle RST is 99 degrees.
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