Find the perimeter of this triangle. 13 in. 7 in. 8 in. Solution Add the lengths of the sides: P 13 in. 7 in. 8 in. 28 in. EXAMPLE 1 YOU TRY 1 Find the perimeter of this triangle. 5 m 7 m 9 m To fi nd the area of a triangle, we use the following formula. (The derivation of the area formula is given in Appendix B.3.) Formula Area of a Triangle The area, A, of a triangle is Area 1 2 base height or A 1 2 bh where b the length of the base and h the height. height, h base, b The base of the triangle is always the side of the triangle that forms the right angle with the height. The height is not always labeled inside the triangle. Examples: height height base base www.mhhe.com/messersmith SECTION 4.3 Triangles 309
messersmith_power_prealgebra_1e_ch4_7_10
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