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124_G6U25_WB_˙—» ¿º 2011.6.23 3:32 PM ˘ ` 24
124-S1-2
2. A triangular piece of paper is folded. Find the unknown angle.
70 a
40
60
124-S1-2
2. A triangular piece of paper is folded. Find the unknown angle.
70 a
40
60
