The base is 24m long.

m∠B = m∠C = 45°

m∠A = 180° - 2×45° = 90°

m∠ACD = m∠CAD = 45° {Calculate}

AD = CD = 12m

m∠BAD = m∠ABD = 45°

BD = AD = 12m

hence, BC = BD + CD = 24m

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