1st grade secondary - Lectures

1S Trig. Related angles [2]

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1S Trig. Related angles [1]

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1S Geo. Parallel lines and proportional parts + Talis’ theorem

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1S Algebra Forming quadratic equation

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1S Alg. The relation bet. the coefficient of a quadratic equation and its coefficient

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1S Geo. The relation between the areas of two similar polygons + applications on circle

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1S Trigonometric functions

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1S Alg. Determining the type of roots of a quadratic equation

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1S Trig. Directed angle + System of measuring angles

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1St Sec. Geo. Similarity of polygons

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