本题目来源于试卷: Geometry & Shapes，类别为 IB数学
[填空题]
$\mathrm{ABCD} \text { is a quadrilateral where } \mathrm{AB}=9 \mathrm{~cm}, \mathrm{BC}=12 \mathrm{~cm}, \mathrm{CD}=11 \mathrm{~cm}, \mathrm{DA}=8.5 \mathrm{~cm} \text { and } \mathrm{AB} \mathrm{C}=90^{\circ} \text {. Find } \mathrm{AD} \hat{\mathrm{D}} \text {, giving your answer correct to the nearest degree. }$ ≈ $^{\circ}$
参考答案: 100±2%
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