YOU TRY 2 Find the area of each triangle. a) 37 in. 40 in. b) 13 in. 12 in. 1 m 1 3 2 m 1 2 2 m 5 6 c) 13 cm 10 cm 5 cm Let’s put together what we know about different shapes to solve a problem. Find the area of the shaded region. 8 in. 20 in. 20 in. 7 in. Solution The area of the shaded region is the area of the square minus the area of the triangle. Square Triangle Length of a side: s 20 in. b 8 in. and h 7 in. A s2 (20 in.)2 400 in2 A 1 2 bh 1 2 (8 in.)(7 in.) 28 in2 Area of the Area of Area of shaded region the square the triangle 400 in2 28 in2 372 in2 The area of the shaded region is 372 in2. EXAMPLE 3 YOU TRY 3 Find the area of the shaded region. 10 ft 22 ft Next we will learn about angle measures in a triangle. 22 ft 12 ft www.mhhe.com/messersmith SECTION 4.3 Triangles 311
messersmith_power_prealgebra_1e_ch4_7_10
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