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先證明三角形ACD與三角形BAE全等方法與三角形ABD與三角形BCE全等相同於是有角CAD=角ABE在三角形ABE中,內角和為180度,即角ABE+角AEB=180度-角EAB(60度)=120度則角CAD+角AEB=180度-角EAB(60度)=120度在三角形AEF中,…
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