Angles (Including Parallel Lines): WJEC GCSE Foundation November 2019 Unit 2 Q12 – Westie's Workshop

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Foundation November 2019 Unit 2 Q12

WJECFoundationCurrent spec3 marksAngles (Including Parallel Lines)Angles in Polygons

12.

Triangle formed by two crossing lines and a horizontal line; angle 73° is at the top crossing point above the triangle and f is the vertically opposite angle inside the triangle; g is the bottom-left interior angle; at the bottom right the exterior angle between the horizontal line extended and the side is 128°

Diagram not drawn to scale

Calculate the size of each of the angles f and g. [3]

f = …………… ° g = …………… °

Mark scheme

Scheme	Marks	Comments
f = 73(°)	B1
g = 128 – 73	M1	F.T. 128 − ‘their f’.
= 55(°)	A1

Alternative method

Scheme	Marks	Comments
f = 73(°)	B1
g = 180 – (180 −128) – 73	M1	FT ‘their f’.
= 55(°)	A1

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