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Isosceles Triangle Calculator

side a side b
angle A angle B


Area:
Perimeter:
Circumscribed Circle Radius:
Inscribed Circle Radius:
Height of a:
Height of b:
Angle Bisector of a:
Angle Bisector of b:
Median of a:
Median of b:




Isosceles Triangle Equations

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

Note: all scalene triangle formulas are suitable for isosceles triangle calculations. Click here for scalene triangle calculators.

Area (K) K2 = b2 * (4 × a2 - b2) / 16
Perimeter 2 × a + b
Angle Bisector of Side b ( tb ) tb2 = 4 × a2 - b2 / 2
Angle Bisector of Side a( tb ) ta2 = b2 × a × (2a + b) / (a + b)2
Media of Side a ( ma ) ma2 = (2 * b2 + a2) / 4
Media of Side b ( mb ) mb2 = (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))