Geometry & Shapes (id: 4a81e18c7)

本题目来源于试卷: Geometry & Shapes，类别为 IB数学

[填空题]
The following diagram shows triang kuw)5n lme4x/gtui o.:xt: -rfm)bhro. o u62le $ \mathrm{PQR}$ , with $\mathrm{PQ}=10 \mathrm{~cm}$, $\mathrm{PR}=6 \mathrm{~cm}$ , $0^{\circ}<\mathrm{Q} \hat{\mathrm{P}} \mathrm{R}<90^{\circ}$ and $ \cos (\mathrm{Q} \hat{\mathrm{P}} \mathrm{R})=\frac{4}{5}$ .



1. Find $\sin (\mathrm{QP} R) $.   
2. Find the area of triangle P Q R .    $cm^2$
3. Find QR.a$\sqrt{b}$ ≈   

参考答案:
空格1: 3/5±2%  空格2: 18±2%  空格3: 6.32±2% 


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