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### 13 Cards in this Set

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 We use _____ as an approximation for pi. 3.14 One way to find the area of a parallelogram or a trapezoid is to divide the figure into _____ triangles. Then we can find the area of each triangle and add them together. two We measure area in ________ units. square It is sometimes helpful to think of a _____________ sign as "the opposite of." negative Area of a rectangle = ___x___ length x width Area of a square = ___x___ side x side (or square the length of a side) -(-3) - [-(-4)] + [-(-6)] -(-3) - [+4] + [+6]= +(+3) + (-4) + (+6)= (+9) + (-4) = 5 The ______ of a closed figure is the number of square units contained in the figure. area -2 is the __________ of 2. opposite To find the area of a triangle, we multiply the base times the height and then divide by _____. 2 When looking for the height of a triangle, we need to remember that the base must be ____________ to the height. perpendicular Area of a __________ = (pi)(radius)(radius) (or "pi r squared") circle +(-5) + [-(-6)] = +(-5) + [+6] = +1