OpenStax, Algebra and Trigonometry 2e §10.2 Non-right Triangles: Law of Cosines · Exercise 27 · Trigonometry · Laws of sines & cosines
Non-right Triangles: Law of Cosines · Exercise 27
Use Heron’s formula to find the area of the triangle. Round to the nearest hundredth.
Find the area of a triangle with sides of length 18 in, 21 in, and 32 in. Round to the nearest tenth.
OpenStax, Algebra and Trigonometry 2e · §10.2 Non-right Triangles: Law of Cosines · Exercise 27
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