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geometry

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Source: — Problem Solving |

by mathbyvemuri » Sun Jun 10, 2012 4:45 am
1. internal angle a = 15
internal angle b = 180-80 = 100
ext angle c = int a+ int b = 115

2.90+x+x = 180 => x = 45

3.90+x+35 = 180 => x = 55
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