5.3 Drawing lines and quadrilaterals · Unit 5 Angles and constructions

1 · Teaching slidesuse ← → keys

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2 · Key words

protractorThe instrument used to measure and draw angles.

parallelAlways the same distance apart; marked with matching arrows.

perpendicularAt a right angle; marked with a small square.

squareFour equal sides and four right angles.

rectangleFour right angles, opposite sides equal.

rhombusFour equal sides, opposite angles equal.

parallelogramTwo pairs of parallel sides.

trapeziumExactly one pair of parallel sides.

kiteTwo pairs of equal sides next to each other.

3 · Summary of the sectionrevise from this

Measure and draw angles with a protractor; measure lengths with a ruler.
Put the centre of the protractor on the vertex and one arm on a zero, then read that same scale round to the other arm.
Check every reading against how the angle looks: an acute angle cannot be 130°.
Parallel lines are marked with matching arrows; perpendicular lines with a small square.
Square: four equal sides, four right angles. Rectangle: four right angles.
Rhombus: four equal sides. Parallelogram: two pairs of parallel sides.
Trapezium: exactly one pair of parallel sides. Kite: two pairs of adjacent equal sides.
In any parallelogram, adjacent angles add to 180° and opposite angles are equal.