Isosceles (equilateral) triangle calculator

Side a Side b
Angle A Corner B
area:
perimeter:
Circumcircle radius:
Incircle radius:
Height of side a:
Height of side b:
a Angle bisector:
b Angle bisector:
Side a midline:
Side b midline:

Area(K) K2 = b2 * (4 × a2 - b2) / 16
perimeter 2 × a + b
Side b angle bisector (tb ) tb2 = 4 × a2 - b2 / 2
Side a angle bisector (tb ) ta2 = b2 × a × (2a + b) / (a + b)2
Side a midline (ma ) ma2 = (2 * b2 + a2) / 4
Side b median (mb ) mb2 = (4 * a2 - b2) / 4
Circumcircle radius a / ( 2 * sin (A)) or b / ( 2 * sin (B))
Inscribed circle radius (r) r2 = b2 × (2a - b) / (4 × (2a + b))