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Triangle Calculator
Area, perimeter, sides & angles – from SSS, SAS, ASA, or Base & Height.
Triangle Solver
Calculation Method
SSS – Three Sides
SAS – Two Sides & Included Angle
ASA – Two Angles & Included Side
Base & Height (Area only)
Side a
Side b
Side c
Side b
Side c
Angle A (°)
Angle A (°)
Angle B (°)
Side c
Base
Height
Area
6
Perimeter
12
Side a
3
Side b
4
Side c
5
Angle A
36.87°
Angle B
53.13°
Angle C
90°
Sides:
a = 3, b = 4, c = 5
Angles:
A = 36.87°, B = 53.13°, C = 90°
Area:
6
Perimeter:
12
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How it works
SSS (Three Sides)
– area via Heron's formula, angles via Law of Cosines.
SAS (Two Sides & Included Angle)
– third side via Law of Cosines, then SSS for angles, area = ½bc sin(A).
ASA (Two Angles & Included Side)
– third angle = 180° − sum, other sides via Law of Sines, area = ½ab sin(C).
Base & Height
– area = ½ × base × height.
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