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10.5 Trig and Area.notebook January 16, 2014 Unit 7: Area 10.5 Trigonometry and Area What is the area of a regular pentagon with 4 inch sides? What is the area of a regular octagon with 7.5 cm sides? 10.5 Trig and Area.notebook January 16, 2014 Find the area of each to the nearest tenth. 1. decagon with side length 4 yd 2. nonagon with radius of 7 in A tabletop has the shape of a regular decagon with a radius of 9.5 in. • What is the area of the tabletop to the nearest square inch? • If the radius was doubled, how would the area change? 10.5 Trig and Area.notebook January 16, 2014 Theorem 108 Area of a Triangle given SAS Area = ½(side)(side) sin(angle) side e le sid ang c A b Where does this formula come from?