If the perimeter of a right angled isosceles triangle July 8, 2019 16 32 64 128 If the perimeter of a right angled isosceles triangle is √2+1 If the perimeter of an isosceles right angled triangle is 2p then its area is Perimeter of an isosceles triangle Perimeter of triangle In a right triangle one angle measures x° where sin ° = x 4 5 . what is cos(90° − °) x