Using the defects method, which relationship represents the Law of Cosines if the measure of the included angle between the sides a and b of ΔABC is less than 90°?
A. area of square c2 = -area of square a2 − area of square b2 + area of defect1 + area of defect2
B.area of square c2 = area of square a2 + area of square b2 + area of defect1 − area of defect2
C.area of square c2 = area of square a2 + area of square b2 − area of defect1 − area of defect2
D. area of square c2 = area of square a2 + area of square b2 + area of defect1 + area of defect2

Question

Using the defects method, which relationship represents the Law of Cosines if the measure of the included angle between the sides a and b of ΔABC is less than 90°?
A. area of square c2 = -area of square a2  − area of square b2 + area of defect1 + area of defect2
B.area of square c2 = area of square a2  + area of square b2 + area of defect1 − area of defect2
C.area of square c2 = area of square a2  + area of square b2 − area of defect1 − area of defect2
D. area of square c2 = area of square a2  + area of square b2 + area of defect1 + area of defect2

perl · Answer

this is an animation that shows defect

perl · Answer

http://illuminations.nctm.org/Activity.aspx?id=4198

perl · Answer

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