. So, in an isosceles triangle ABC where AB = AC, we have ∠B = ∠C. Area = 1/2 × Base × Height Area = b 2√a2 − b2 4 b 2 a 2 − b 2 4 Area = 1/2 ×abSinα (Here a and b are the lengths of two sides and α is the angle between these sides. . Geometry; Triangle; Calculate isosceles, right triangles. b=√h2+ a2 4 θ=tan−1(2h a) S = 1 2ah b = h 2 + a 2 4 θ = t a n − 1 ( 2 h a) S = 1 2 a h select elements base a height h. 30 60 90 TriangleCalculator 45 45 90 TriangleCalculator Area of a Right TriangleCalculator Classifying Triangles Calculator Equilateral TriangleCalculator Heron's Formula Calculator Hypotenuse CalculatorIsoscelesTriangleCalculator Perimeter of a TriangleCalculator Pythagorean Theorem Calculator Pythagorean Triples Calculator Right. Obtuse angle triangle: When the angle between a pair of sides is greater than 90 degrees it is called an obtuse angle triangle. Its circumference is 28 cm. An online hypotenuse of a triangle calculator 100% free and helps you to find the length of different sides of a triangle quickly. Area of triangle is 10.