Mathematics
Special Right Triangles: 45-45-90 and 30-60-90
Students use the side-ratio patterns of 45-45-90 and 30-60-90 triangles to find missing sides, including square diagonals and equilateral-triangle heights.
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Mathematics
Triangle Angle Sum and Exterior Angles
Students use the 180° angle sum and the exterior angle theorem to find missing angles, and classify triangles by their angles and sides.