Unit converter
Partial-fill cylindrical tank (upright)
Assumes vertical (upright) cylinder with flat bottom: V = π r² h_fill. For horizontal tanks use the card below.
Partial-fill cylindrical tank (horizontal)
Flat ends assumed: A = r² cos⁻¹((r−h)/r) − (r−h)√(2rh−h²), V = A·L. Dished/hemispherical ends not in this version.
Solids
Right triangle solver
Enter any 2 values (at least one side). C = 90°. a, b legs; c hypotenuse; A opposite a, B opposite b (degrees).
Areas
Circle: arc, chord & sector
Arc = θ_rad·r · Chord = 2r sin(θ/2) · Sector = ½ r² θ_rad · Segment = ½ r² (θ_rad − sin θ).
Triangles: equilateral (3 equal sides), isosceles (2 equal), scalene (none equal); right (one 90°), acute (all <90°), obtuse (one >90°). Angles: acute <90°, right = 90°, obtuse 90–180°, straight = 180°, reflex >180°.