make three points common with making 2 angles
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https://www.meritnation.com/ask-answer/question/diagram-of-two-angles-such-that-they-have-one-point-in-comm/basic-geometrical-ideas/1520847
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https://www.meritnation.com/ask-answer/question/diagram-of-two-angles-such-that-they-have-one-point-in-comm/basic-geometrical-ideas/1520847
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