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Mathematics — First Preparatory Mathematics — Second Preparatory Mathematics — Third Preparatory

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Integrated Science — First Secondary

Lesson 1

Parallel Lines and Bisectors

Lesson parts

1.1 3-1 The line parallel to one side of a triangle3-1 The line parallel to one side of a triangle1.1

1.2 3-2 The converse3-2 The converse1.2

1.3 3-3 Consequences: the midline3-3 Consequences: the midline1.3

1.4 3-4 Thales' general theorem (the intercept theorem)3-4 Thales' general theorem (the intercept theorem)1.4

1.5 3-5 Applications in the trapezoid3-5 Applications in the trapezoid1.5

1.6 3-6 The internal bisector theorem and its converse3-6 The internal bisector theorem and its converse1.6

1.7 3-7 The external bisector theorem3-7 The external bisector theorem1.7

1.8 3-8 Lengths of the internal and external bisectors3-8 Lengths of the internal and external bisectors1.8

1.9 3-9 Mixed applications with areas3-9 Mixed applications with areas1.9

1.10 Exam traps and key takeawaysExam traps and key takeaways1.10