Since an isosceles triangle has 2 equal sides and one different side, the formula that is used to find the perimeter is, Perimeter of isosceles triangle = 2a + b where 'a' is one of the equal sides and 'b' is the unequal side. The perimeter of an isosceles triangle is the total length of its boundary. How to find the Perimeter of an Isosceles Triangle? Since an isosceles triangle has two equal sides, the perimeter is twice the equal side plus the different side. The perimeter of an isosceles triangle is the sum of all the three sides. The perimeter of an isosceles right triangle can be calculated with the help of the formula: P = h + 2l, where 'h' is the length of the hypotenuse and 'l' is the length of the adjacent sides.įAQs on the Perimeter of Isosceles Triangle What is the Perimeter of Isosceles Triangle?.The formula to calculate the perimeter of an isosceles triangle is P = 2a + b where 'a' is the length of the two equal sides and 'b' is the base of the triangle.Since an isosceles triangle has two equal sides, its perimeter can be calculated if the base and the equal sides are known.A triangle is considered to be an isosceles triangle if it has two equal sides.Here is a list of a few points that should be remembered while studying the perimeter of an isosceles triangle: Important Notes on Perimeter of Isosceles Triangle It should be noted that the two congruent angles in the isosceles right triangle measure 45° each. When the hypotenuse is given: Referring to the explanation given above, if the hypotenuse (h) is given, then the perimeter of an isosceles right triangle will be (P) = h + 2(h/√2) = h + √2h = h(1 + √2).When the length of the equal side is given: Referring to the explanation given above, if the length (l) is given, then the perimeter of an isosceles right triangle will be (P) = 2l + (√2)l = (2 + √2)l.These values can be substituted with each other if one of them is not known. This means h = √2 × l, which can also be written as: l = h/√2. If we apply the Pythagoras theorem in the figure, we get h = √(l 2+ l 2) = √2 × l. Now, let us find the perimeter of an isosceles right triangle in 2 different scenarios given below. Observe the following figure to understand the dimensions and the formula of an isosceles right triangle.Īs given in the figure, the perimeter of an isosceles right triangle is P = h + 2l. If the length of the hypotenuse is 'h' units and the lengths of the other two sides are 'l', then the perimeter of an isosceles right triangle would be: Perimeter of isosceles right triangle = h + l + l. Since it is a right-angled triangle, one of its sides is the hypotenuse and the other two sides are equal. 3.496 cm², d.The perimeter of an isosceles right-angled triangle can be found by adding the length of all its three sides. The area of an equilateral triangle with side 2√3 cm is a.The sides of a triangle are 56 cm, 60 cm and 52 cm long.The perimeter of an equilateral triangle is 60 m.An isosceles right triangle has area 8 cm². √24 cmĪn isosceles triangle is defined as a triangle that has two sides of equal measure. NCERT Exemplar Class 9 Maths Exercise 12.1 Problem 1 An isosceles right triangle has area 8 cm². ☛ Also Check: NCERT Solutions for Class 9 Maths Chapter 12 ✦ Try This: An isosceles right triangle has area 36 cm². Therefore, the length of the hypotenuse is √32 cm. We know that in an isosceles triangle two sides are of equal length. We have to find the length of its hypotenuse. Given, an isosceles right triangle has area 8 cm².
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