Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 6 - No. 34)
If you know two sides and the angle *between* those sides in a triangle, which formula for area is appropriate?
Area = 1/2 * base * height
Area = 1/2 * a * b * sin C
Area = √(s(s-a)(s-b)(s-c))
Area = (a + b + c)/2
คำอธิบาย
1/2 * a * b * sin C is the formula