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gruence of angles and Inequalitics Criansles and Inequalities in a Triangle 275 the In CRS e triungle on A Side CD of a AADE SABCE Srpent figure, ACDE is an equilateral cole ort a side CD of a square ABCD. Show that square ABCD WE ADE In 4 ADE an AADE S ABCE. ABCD and an equilateral ACDE on side CD. ADE and ABCE, we have AD = BC (sides of the same square) DE=CE (sides of an equilateral triangle) LADE = ZBCE ([each equal to (90° +60°) = 150°) AADE = ABCE [by SAS-criteria).

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