The perpendicular bisector of one side of a triangle bisects the angle opposite that side. Write T for each statement that is true, and write F for each statement that is false. Each triangle has marks showing which sides and angles are congruent. Want to change the area unit? Simply click on the unit name, and a drop-down list will appear. 42 Isosceles and Equilateral Triangles notes.notebook 2 In isosceles triangle ABC, the vertex angle is 20 more than twice the base angles. Question: 4-2 Reteach to Build Understanding Isosceles and Equilateral Triangles 1. Regular polygon area formula: A = n × a² × cot(π/n) / 4.Quadrilateral area formula: A = e × f × sin(angle).Octagon area formula: A = 2 × (1 + √2) × a².Hexagon area formula: A = 3/2 × √3 × a².Trapezoid area formula: A = (a + b) × h / 2.Plug in the integer or decimal dimensions in the area of a triangle formula a 1 2 b h and solve for the area. So in every equilateral triangle the angles are always 60.
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