Problem Solving (PS) | Re: In ∆ PQR above, w =

Let the Inner triangles unknown angles be x and y,

1. For inner triangle,
x+y+140=180 (sum of all angles in a triangle)

x+y=40 --(1)

2. For triangle PQR,
Sum of all angles = 35+x+y+40+w=180
using (1)
35+40+40+w=180
w=65

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