O-LevelMathematicsGeometry4024/11 · Oct/Nov 2018 · Q183 Marks
Four interior angles of a hexagon are 100°, 110°, 120° and 140°. The remaining two interior angles are equal to each other. Calculate the size of one of these interior angles.
- Four interior angles of a hexagon are 100°, 110°, 120° and 140°. The remaining two interior angles are equal to each other. Calculate the size of one of these interior angles.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- 18 125 nfww [3]
- B1 for angle sum = (6 – 2) × 180°; or 720°
- M1 for their(720) - (100+110+120+140) / 2
- OR M1 for 360 – X, where X is 2y + (180 – 100) + (180 – 110) + (180 – 120) + (180 – 140) and y is the unknown exterior angle
- B1 for [exterior angle =] 55 seen
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