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3 courses
Congruent Triangles and Their Properties
Mathematics · High School (9–10), General · Triangles
FreeCh 9 · 1/3
When two triangles are exactly equal: the SAS, ASA, SSS and RHS rules, the properties of an isosceles triangle, and the inequalities between the sides and angles of a triangle.
3Lessons11Problems2Python Labs1Question Set1Mock Test
Similar Triangles and the Basic Proportionality Theorem
Mathematics · High School (9–10), General · Triangles
FreeCh 9 · 2/3
Similar figures and the two conditions for similar triangles. Then Thales' theorem, its converse, and the way a line parallel to one side cuts the other two in the same ratio.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Criteria for Similarity, Areas and the Pythagoras Theorem
Mathematics · High School (9–10), General · Triangles
FreeCh 9 · 3/3
The AA, SSS and SAS criteria for similarity. Then the ratio of the areas of similar triangles, and the Pythagoras theorem and its converse proved by similar triangles.
3Lessons10Problems2Python Labs1Question Set1Mock Test