Area of a triangle using Heron and Sin Rules

If any two sides and the angle between them are given, then the formulas to calculate the area of a triangle is given by:

Area (∆ABC) = ½ bc sin A

Area (∆ABC) = ½ ab sin C

Area (∆ABC) = ½ ca sin B

Option #2 - Given 2 sides and an included angle

Area of an Equilateral Triangle  A = (√3)/4 × side2

Option #3 - Area of an Equilateral Triangle

Area Practice #1 

Area Practice #2 (Heron) 

Practice #3 (Combined Shapes) 

Practice #4 (sin) with answers 

Practice #5 Area with sin 

Area Practice #6 using Heron