Triangles: Forming Shapes

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Build and explore triangles step by step.

Madison Webb

United States

#	Jeux	Précision	temps
1	Madison Webb 2 Février 2026	% 100	00:37

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Triangles: Forming ShapesVersion en ligne Build and explore triangles step by step. par Madison Webb 1 Introduction Welcome to forming triangles. Today we explore how lines connect to make three-sided figures, and how sides and angles work together. 2 What is a Triangle? A triangle is a polygon with three sides and three angles. The three sides meet at three vertices to form a closed shape. 3 Sides and Angles Triangles have three sides and three interior angles. The sum of the interior angles is always 180 degrees. 4 Types by Sides By side lengths: Equilateral (all sides equal), Isosceles (two sides equal), and Scalene (no equal sides). 5 Types by Angles By angles: Acute (all angles < 90°), Right (one angle = 90°), and Obtuse (one angle > 90°). 6 Triangle Inequality For any triangle, the sum of any two sides must be greater than the third side. This ensures a real triangle forms. 7 Constructing Triangles Using a ruler to draw sides and a compass to mark equal lengths helps form precise triangles. 8 Perimeter Basics The perimeter is the total length of all three sides. Add sides together to find the distance around the triangle. 9 Angles Sum Practice In any triangle, if you know two angles, you can find the third angle by using 180° minus the sum of the known angles.