How do you find the area of a triangle with a=7, b=9, c=12? Trigonometry Triangles and Vectors Area of a Triangle 1 Answer zoe Oct 18, 2015 6.556.55 Explanation: You can use the formula 1/2ab sin C12absinC to calculate the area of a triangle. 1/2*7*9* sin 1212⋅7⋅9⋅sin12 = 6.55 rArr6.55⇒ (correct to 3 s.f) Answer link Related questions How do you find the area of a triangle with 3 sides given? What is the area of a equilateral triangle with a side of 12? How do you find the area of a triangleABC, if angleC = 62^@∠C=62∘, b = 23.9b=23.9 , and a = 31.6a=31.6? How do you find the area of a triangleGHI, if angleI = 15^@∠I=15∘, g = 14.2g=14.2 , and h = 7.9h=7.9? What is Heron's formula? When do you use Heron's formula to find area? How do you find the area of a triangle ABC, if a = 23a=23, b = 46b=46 , and c = 41c=41? Question #f2e4c How do you find the area of the triangle given c= 4, A= 37 degrees, B= 69 degrees? How do you find the area of the triangle given C=85 degrees, a= 2, B= 19 degrees? See all questions in Area of a Triangle Impact of this question 2718 views around the world You can reuse this answer Creative Commons License