| Exam Board | Edexcel |
|---|---|
| Module | C2 (Core Mathematics 2) |
| Year | 2011 |
| Session | January |
| Marks | 6 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Sine and Cosine Rules |
| Type | Sequential triangle calculations (basic) |
| Difficulty | Moderate -0.8 This is a straightforward two-part question requiring direct application of the cosine rule to find an angle, then the standard area formula. Both are routine calculations with no problem-solving or conceptual challenges, making it easier than average but not trivial since it requires correct formula selection and calculator work. |
| Spec | 1.05b Sine and cosine rules: including ambiguous case1.05c Area of triangle: using 1/2 ab sin(C) |
| Answer | Marks |
|---|---|
| 2 | -12 |
| 2.1 | -15.08 |
| 2.2 | -17.92 |
| 2.3 | -20.52 |
| 2.4 | -22.88 |
| 2.5 | -25 |
Question 2:
2 | -12
2.1 | -15.08
2.2 | -17.92
2.3 | -20.52
2.4 | -22.88
2.5 | -252. In the triangle $A B C , A B = 11 \mathrm {~cm} , B C = 7 \mathrm {~cm}$ and $C A = 8 \mathrm {~cm}$.
\begin{enumerate}[label=(\alph*)]
\item Find the size of angle $C$, giving your answer in radians to 3 significant figures.
\item Find the area of triangle $A B C$, giving your answer in $\mathrm { cm } ^ { 2 }$ to 3 significant figures.
\end{enumerate}
\hfill \mbox{\textit{Edexcel C2 2011 Q2 [6]}}