Higher January 2021 Paper 1R Q14
14

Diagram NOT accurately drawn
\(B\), \(D\), \(E\) and \(F\) are points on a circle.
\(ABC\) is the tangent at \(B\) to the circle.
Angle \(ABD = 39°\)
Angle \(EFD = 18°\)
Work out the size of angle \(BDE\).
Give reasons for your working.
(4)
| Scheme | Marks |
|---|---|
| \(BFD = 39°\) or \(BED = 39°\) | B1 |
| \(BDE = 180 - (18 + 39)\) or \(EBD = 18°\) and \(BDE = 180 - (18 + 39)\) | M1 |
| Working required Answer: 123 | A1 |
| B1 | |
| (4) | |
| (4 marks) |
Notes
B1: dep on M1
for all correct circle theorems relevant for their method e.g.
alternate segment theorem and opposite angles in a cyclic quadrilateral sum to 180°
or
alternate segment theorem and angles in same segment are equal