If two sides of a triangle have equal length (or two angles are equal), then this triangle is an isosceles triangle. Click here for scalene triangle calculators.

• Area (K)
K² = b² * (4 × a² - b²) / 16

• Perimeter
2 × a + b

• Angle Bisector of Side b ( t_b )
t_b² = 4 × a² - b² / 2

• Angle Bisector of Side a( t_b )
t_a² = b² × a × (2a + b) / (a + b)²

• Media of Side a ( m_a )
m_a² = (2 * b² + a²) / 4

• Media of Side b ( m_b )
m_b² = (4 * a² - b²) / 4

• Circumscribed Circle Radius
a / ( 2 * sin (A)) or
b / ( 2 * sin (B))

• Inscribed Circle Radius (r)
r² = b² × (2a - b) / (4 × (2a + b))