In the isosceles triangle, this line will always hit the base at its exact midpoint. The length of this line will be the height of the triangle, so label it as h. Step-2: Draw a perpendicular line between the base to the opposite vertex. The base is the easy part, and just use the third unequal side as the base. Step-1: Find the isosceles triangle’s base. Procedure to compute the area of an isosceles triangle: The altitude of a triangle is a perpendicular distance from the base to the topmost.If the 3 rd angle is a right angle, it is called a “right isosceles triangle”.The base angles of the isosceles triangle are always equal.The unequal side of an isosceles triangle is normally referred to as the ‘base’ of the triangle.Let us learn the methods to find out the area, altitude, and perimeter of such an isosceles triangle. These special properties of the isosceles triangle will help us to calculate its area from just a couple of pieces of information. Therefore, in an isosceles triangle, two equal sides join at the same angle to the base i.e. Thus in an isosceles triangle, we have to draw a perpendicular from the vertex which is common to the equal sides. It is unlike an equilateral triangle where we can use any vertex to find out the altitude. 2 Solved Examples Area of Isosceles Triangle Formula Definition of Isosceles Triangle:Īn isosceles triangle is a triangle with two sides of equal length and two equal internal angles adjacent to each equal sides.
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