P = a + b + c Find the perimeter of a triangle when a = 3 cm, b = 5 cm, and c = 7 … Our online calculators, converters, randomizers, and content are provided "as is", free of charge, and without any warranty or guarantee. where a, b, c are length of side of a triangle. Grace is currently a math instructor at the City College of San Francisco and was previously in the Math Department at Saint Louis University. Finding area of triangles. Because the sides of the equilateral triangle are equal, the perimeter is … Area of triangles. The formula for the perimeter of a triangle T is T = side a + side b + side c, as seen in the figure below: However, given different sets of other values about a triangle, it is possible to calculate the perimeter in other ways. If you only know the length of 2 of the triangle’s sides, you can still find the perimeter if it’s a right triangle, which means the triangle has one 90-degree angle. We are not to be held responsible for any resulting damages from proper or improper use of the service. Moreover it allows specifying angles either in grades or radians for a more flexibility. Right triangle calculator to compute side length, angle, height, area, and perimeter of a right triangle given any 2 values. That makes a perimeter of 27 cm. The sizes of the angles of the triangle ABC are α = 35° and β = 48°. https://www.gigacalculator.com/calculators/perimeter-of-triangle-calculator.php. Also explore many more calculators covering geometry, math and other topics. Include your email address to get a message when this question is answered. Two sides of a triangle are each 7 cm long. Example 2: In a slightly more complicated task, we are given two of the sides and the angle between them. The distance formula is used to find the distances between vertices then these distances are used to find the perimeter and area of the triangle. Using those values, we will calculate the Perimeter of a triangle, Semi Perimeter of a triangle, and then Area of a Triangle. The base of an isosceles triangle is 4/3 cm. Thanks! If you know only 1 side but all 3 angles, you can use the rule of sines to find the remaining sides, then calculate the perimeter. The perimeter of the triangle is 42/15 cm. The algorithm of this right triangle calculator uses the Pythagorean theorem to calculate the hypotenuse or one of the other two sides, as well as the Heron formula to find the area, and the standard triangle perimeter formula as described below. Example: the perimeter of this regular pentagon is:. By using our site, you agree to our. More in-depth information read at these rules. Perimeter is the length of the outer edge or boundary of a 2-dimensional shape and is expressed in units of length, such as inches or feet. Therefore, the perimeter of the triangle is 15. This website uses cookies to ensure you get the best experience. It depends on where the angle is situated in relation to the two sides. A right triangle has one internal angle exactly 90 degrees. Finding the Perimeter When Three Side Lengths are Known, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/38\/Find-the-Perimeter-of-a-Triangle-Step-1-Version-2.jpg\/v4-460px-Find-the-Perimeter-of-a-Triangle-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/3\/38\/Find-the-Perimeter-of-a-Triangle-Step-1-Version-2.jpg\/aid2157327-v4-728px-Find-the-Perimeter-of-a-Triangle-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"