Given: mtrv = 60° mtrs = (4x)° prove: x = 30
what is the missing reason in step 3?
substitution property of equality
angle addition postulate
subtraction property of equality
addition property of equality

The Angle addition Postulate   :The postulate describes that putting two angles side by side with their vertices together creates a new angle whose measure equals the sum of the measures of the two original angles.Given the sum of a pair of angles and the algebraic expressions that represent them we can form and solve an equation.

It is given mTRV = 60° mTRS = (4x)° Prove: x = 30'

In statement 3 we have m<TRS+M<TRV=180(The angles add to given 180)

The missing reason in step 3 is angle addition postulate.

answer rather than having to add and subtract the measurements of the semi-circle, notice that the semicircle to the left of ad is actually identical in area to the blank semicircle-shaped space to the left of bc. so if we transferred the red semicircle into the blank space, we would end up with a square of side length 24 cm. the area of a square is s^2 = 24^2 = 676 cm^2.

u also answered this so i think u would know but i am here to

put in or use mine