| Exam Board | OCR |
|---|---|
| Module | C2 (Core Mathematics 2) |
| Marks | 5 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Sine and Cosine Rules |
| Type | Triangle area calculation |
| Difficulty | Moderate -0.3 This is a straightforward application of Heron's formula or the cosine rule followed by area = ½ab sin C. It requires recall of standard formulas and careful arithmetic but no problem-solving insight. Slightly easier than average since it's a single-step calculation with no complications, though the arithmetic requires some care. |
| Spec | 1.05c Area of triangle: using 1/2 ab sin(C) |
3. The sides of a triangle have lengths of $7 \mathrm {~cm} , 8 \mathrm {~cm}$ and 10 cm .
Find the area of the triangle correct to 3 significant figures.\\
\hfill \mbox{\textit{OCR C2 Q3 [5]}}