Geometry & Shapes (id: e32d8dea9)

本题目来源于试卷: Geometry & Shapes，类别为 IB数学

[填空题]
The following diagram show+af.hgc* s* b v:ut*ems tri/r2pn rij r2qq 6yv*(cangle $ \mathrm{ABC}$ , with $\mathrm{AB}=7 \mathrm{~cm}$,$ \mathrm{AC}=5 \mathrm{~cm} $, $ 0^{\circ}<\mathrm{BA} \mathrm{C}<90^{\circ}$ and $ \sin (\mathrm{BA} \mathrm{A})=\frac{4}{5}$



1. Find the area of triangle A B C . ≈    $cm^2$
2. Find $\cos (\mathrm{BA} C)$ .   
3. Find BC. $a\sqrt{b}$ ≈   

参考答案:
空格1: 14±2%  空格2: 3/5±2%  空格3: 5.66±2% 


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