Triangle Area Calculator
How to use this calculator:
Use the sliders to adjust the triangle's sides and angle
Try to calculate the area yourself using the formula: Area = ½ × a × b × sin(C)
Toggle "Show Area Calculation" off to hide the area and test yourself
Turn it back on to check your work
Use the "Randomize Triangle" button for more practice
Show Area Calculation
1
Adjust the sides and included angle
Side a (blue):
100
units
Side b (green):
120
units
Included Angle C:
60
°
2
Apply the SAS area formula
Area = ½ ×
a
×
b
× sin(
C
)
Area = ½ × 100 × 120 × sin(60°) = 5196.15 square units
Area:
5196.15
square units
Important:
For this formula to work, you must use the two sides that form the included angle C.
Randomize Triangle