If Ф₁, Ф₂, Ф₃ be the angles subtended by the arcs l₁, l₂,l₃ at the center of the circle whose radii are r₁, r₂, r₃, show that the angle subtended by the arc l₁ + l₂ + l₃ at the center whose radius is r₁ + r₂ + r₃ will be r₁Ф₁ + r₂Ф₂ + r₃Ф₃ / r₁ + r₂ + r₃
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