Isosceles Triangle Calculator


side a
side b

angle A (°C)
angle B (°C)



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. 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))
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