Foundation June 2017 Paper 1 Q11
11 A triangle has perimeter 32 cm
Not drawn accurately
A square has perimeter 40 cm
Two sides of the shapes are put together to make a pentagon.
Not drawn accurately
Work out the perimeter of the pentagon. [4 marks]
| Answer | Mark | Comments |
|---|---|---|
| Alternative method 1 | ||
| \(40 \div 4\) or 10 or 30 | M1 | Accept evidence on diagram |
| 32 \(-\) their 10 or 22 | M1dep | Accept evidence on diagram |
| \(3 \times\) their 10 \(+\) their 22 | M1dep | dep on M2 |
| 52 | A1 | |
| Alternative method 2 | ||
| \(40 \div 4\) or 10 or 30 | M1 | Accept evidence on diagram |
| \(2 \times\) their 10 or 20 | M1dep | |
| \(32 + 40 -\) their 20 | M1dep | dep on M2 |
| 52 | A1 | |
Additional guidance
| The two top sides on the triangle given values adding to 22 can be accepted as evidence of 22 | |
| Beware of appearance of 20 for reasons that are not worth the second mark eg 10, 20, 30, 40 | M1 earned at that point |
| Beware - wrong working can lead to the appearance of 52 (after rounding) |