∠D = 60°
AC² = 7² – 3,5² = 49 – 12,25 = 36,75
BC² = 7² – AC² = 49 – 36,75 = 12,25
BC = √12,25 = 3,5
⟹ ∠B = 60°
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∠D = 60°
AC² = 7² – 3,5² = 49 – 12,25 = 36,75
BC² = 7² – AC² = 49 – 36,75 = 12,25
BC = √12,25 = 3,5
⟹ ∠B = 60°