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Cell phone use is prohibited. Students: Today is a red light day. Cell phone use is prohibited. This is your warning.

Area Formula of a triangle: A = ½ • b • h Find the area of each triangle. 1) 2) 3 in 7 m 10 in 8 m A = ½ • (10 in) • (3 in) A = ½ • (8 m) • (7 m) A = ½ • (30 in2) A = ½ • (56 m2) A = 15 in2 A = 28 m2 3) b = 4 yd , h = 9 yd 4) b = 5 ft , h = 8 ft A = ½ • (4 yd) • (9 yd) A = ½ • (5 ft) • (8 ft) A = ½ • (36 yd2) A = ½ • (40 ft2) A = 18 yd2 A = 20 ft2

17.04 Area of a Trapezoid

Every trapezoid has two bases. Base 1 ( b1 ) Height (h) Base 2 ( b2 ) Every trapezoid has two bases. The height is perpendicular to the two bases. Area Formula of a Trapezoid A = ½ • h • (b1 + b2)

Area Formula of a Trapezoid A = ½ • h • (b1 + b2) Find the area. 4 in 5 m 6 in 3 m 13 m 10 in A = ½ • (6) • (4 + 10) A = ½ • (5) • (3 + 13) A = ½ • (6) • (14) A = ½ • (5) • (16) A = ½ • (84) A = ½ • (80) A = 42 in2 A = 40 m2

Area Formula of a Trapezoid A = ½ • h • (b1 + b2) Find the area h = 7 , b1 = 10 , b2 = 4 h = 8 , b1 = 14 , b2 = 6 A = ½ • (7) • (10 + 4) A = ½ • (8) • (14 + 6) A = ½ • (7) • (14) A = ½ • (8) • (20) A = ½ • (98) A = ½ • (160) A = 49 A = 80

Area Formula of a Trapezoid A = ½ • h • (b1 + b2) Find the missing part. b1 = 5 m , b2 = 3 m , A = 32 m2 32 m2 = ½ • (h) • (5 m + 3 m) 32 m2 = ½ • (h) • (8 m) 32 m2 = (h) • (4 m) 8 m = h

Area Formula of a Trapezoid A = ½ • h • (b1 + b2) Find the missing part. b1 = 17 ft , h = 7 ft , A = 70 ft2 70 ft2 = ½ • (7 ft) • (17 ft + b2) 140 ft2 = (7 ft) • (17 ft + b2) 20 ft = 17 ft + b2 3 ft = b2