![]() ![]() PS is perpendicular from vertex P to the side QR. QR is the triangle’s base, and PS is the triangle’s height. In the triangle PQR, PQ, QR, and RP are the sides. So, the Area of a triangle = ½ (Product of base and height of a triangle) If we know the base length and height of a triangle, we can determine its area. The area of different triangles differs based on their size. The area of a triangle is the region that the triangle occupies in 2d space. Triangles classified based on both angles and sides are – To classify triangles according to both angles and sides, we measure the interior angles and length of the sides of the triangle. The types of triangles based on the length of the sides are – Obtuse Triangle or Obtuse-angled Triangle.Right Triangle or Right-angled Triangle.Acute Triangle or Acute-angled Triangle.Triangles can be classified by angles, as: To classify triangles according to their angles, we measure each of their interior angles. Triangles can be classified based on the length of the sides or their angle measurements. The area of a triangle is equal to half of the product of its base and height.The sum of the length of any two sides of a triangle is always greater than the length of the third side.The sum of all three interior angles of a triangle is always equal to 180⁰.In triangle ABC, the vertices are A, B, and C. The point of intersection of any two sides of a triangle is known as a vertex.These angles are also called ∠B, ∠C, and ∠A, respectively. The three angles of the triangle ABC are ∠ABC, ∠BCA, and ∠CAB. The angle formed by any two sides of a triangle is the angle of the triangle, denoted by the symbol ∠.In triangle ABC, the sides are AB, BC, and CA. These shapes cannot be called triangles as – ![]() The above figures are non-examples of triangles. ![]()
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