Geometry & Shapes (id: b393b19e6)

本题目来源于试卷: Geometry & Shapes，类别为 IB数学

[填空题]
The following diagrami n69rlqr50efq9 ,a nn sjnrj535 a8)ilrp7ztihows a right-angled triangle $\mathrm{ABC}$ and a sector ABD of a circle with centre $\mathrm{A}$ . The point $\mathrm{E}$ lies on [AC] such that [BE] is perpendicular to [AC]. The region R is bounded by [DE], [BE] and arc BFD.




$\mathrm{AB}=5 \mathrm{~cm}, \mathrm{AC}=13 \mathrm{~cm}, \mathrm{BC}=12 \mathrm{~cm}$

1. Find B A C , giving your answer in radians.≈   
2. Find the area of R .≈    $cm^2$

[/BE][/BE]

参考答案:
空格1: 1.18±2%  空格2: 10.3±2% 


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