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a + 90⁰ + 100⁰ + 60⁰ = 360⁰(angles around a point) a = 360⁰ - 250⁰ = 110⁰ Angles sum of triangle = 180⁰  Example: Find the angle C from the figure below: C + 60⁰ + 40⁰ = 180⁰ (angles sum of triangles) C = 180⁰ - 100⁰ = 80⁰ Vertically opposite angles are equal Example: a⁰ = b⁰ (vertically opposite angles Alternate angles are equal  Example: Consider the figure below: f = 50⁰ (alternate angles) d = e (alternate angles) What is the value of angle P in the figure below? Angle P = 90⁰ (angle on semicircle)