Answer:
Step-by-step explanation:
we know that
---> by addition angle postulate
we have
----> given problem
substitute in the expression above
Divide by 2 both sides
144 and 18
18 ×24=432÷3=144
11
PC=QC=RC
3x+7=51-x
3x+x=51-7
4 x=44
x=11