Answer: r=89.1
Step-by-step explanation: It has been given that,
PQ=PR
So, it is an isosceles triangle, hence ∠Q=∠R. let it be x
Now, we know that the sum of the angles of a triangle = is 180
∘
.
So,
∠P+∠Q+∠R=180
38.2+52.7+x=180
90.9+x=180
taking 90.9 in RHS it becomes -, so
x=180-90.9
x=89.1