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Arc LO is the intercepted arc of the central angle ∠LSO. We know that a central angle and its intercepted arc is equal.
Half a circle is equal to 180°. Arc LV is half the Circle S. LO measures 50°.
180° - 50° = 130°
130° is the measure of arc OV, and its central angle ∠OSV also measures 130°.
∠LVO is the inscribed angle of the intercepted arc LO, and arc LO measures 50°.
Arc OV measures 130°. ∠OEV is the inscribed angle of Arc OV.
Arc LV is a semi-circle. And arc LV measures 180°. ∠LEV is the inscribed angle of arc LV.