So if you know the length of a side = a, or the perimeter = P, or the semiperimeter = s, or the area = K, or the altitude = h , you can calculate the other values. Notice that the side length of the equilateral triangle is equal to the diameter of the semicircle. Thus Let a be the length of the sides, A - the area of the triangle, p the perimeter, R - the radius of the circumscribed circle, r - the radius of the inscribed circle, h - the altitude (height) from any side.. For an Equilateral Traingle, the perimeter is calculated by adding its three sides. 3 × side. The perimeter of a triangle is the distance covered around the triangle and is calculated as the sum of all the three sides of it. In order to find the perimeter of the entire figure, we will need to find the lengths of the segments highlighted in red. It does not matter if you have a right triangle, isosceles triangle, or an equilateral triangle, all three sides of a triangle can be bisected (cut in two), with the point equidistant from either vertex being the midpoint of that side. Formulas for the area, altitude, perimeter, and semi-perimeter of an equilateral triangle are as given: Where, a is the side of an equilateral triangle. We know that all the sides of an Equilateral Traingle are equal and hence, its perimeter will be 3 times its side, i.e. Explanation: . The ratio of the area to the square of the perimeter of an equilateral triangle, , is larger than that for any other triangle. Algebra Expressions, Equations, and Functions Problem-Solving Models 1 Answer What is the area of an equilateral triangle that has a perimeter of 18 centimeters? The midsegment of a triangle is a line constructed by connecting the midpoints of any two sides of the triangle. The area of an equilateral triangle is the amount of space that it occupies in a 2-dimensional plane. If you have any 1 known you can find the other 4 unknowns. So, an equilateral triangle’s area can be calculated if the length of its side is known. The value of semi-perimeter of an equilateral triangle having area 43cm2 is (a) 8 cm (b) 36 cm (c) 6 cm (d) 6 cm Ans : (c) 6 cm Area of an equilateral triangle a 4 = 3 2 43 a 4 = 3 2 a2 =16 a =4cm Semi-perimeter 2 =444++ 2 =12 =6cm 5. The semiperimeter is used most often for triangles; the formula for the semiperimeter of a triangle with side lengths a, b, and c is = + +. Equilateral Triangle Formula. If a triangle … To recall, an equilateral triangle is a triangle in which all the sides are equal and the measure of all the internal angles is 60°. The lengths of the three sides of a triangular field are 40 m, 24 m and 32 m respectively. Let ABC be an equilateral triangle of side length AB = BC = CA = l, and height h. Let P be any point in the plane of the triangle. If a segment splits an equilateral triangle into two regions with equal perimeters and with areas A 1 and A 2, then: p.151,#J26 ≤ ≤. If O is the center of the triangle, then the Leibnitz relation (valid in fact for any triangle) implies that ... where sis the semi-perimeter of the triangle. Equilateral triangle formulas. For equilateral triangles h = ha = hb = hc. In any triangle, any vertex and the point where the opposite excircle touches the triangle partition the triangle's perimeter into two equal lengths, thus creating two paths each of which has a length equal to the semiperimeter. In other words, the equilateral triangle is in company with the circle and the sphere whose full structures are known only by knowing the radius. Properties.