Triangle Area Calculator
Calculate the area of a triangle using base and height, three sides, or two sides and an angle.
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Area
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Perimeter (if right triangle)
Recent Calculations
What Is Triangle Area?
The area of a triangle is the region enclosed by its three sides. The most common formula uses the base and perpendicular height.
Formula
A = ½ × base × heightExample
A triangle with base 10 and height 6 has area = ½ × 10 × 6 = 30 square units.
Frequently Asked Questions
What if I only know three sides?
Use Heron's formula: A = √(s(s−a)(s−b)(s−c)) where s = (a+b+c)/2.
Can I find the area with two sides and an angle?
Yes: A = ½ × a × b × sin(C), where C is the angle between sides a and b.