Cambridge International Mathematics

Assumed Knowledge

Contents:

A Angles [4.1, 4.3]

B Lines and line segments [4.1]

C Polygons [4.1]

D Symmetry [4.2]

E Constructing triangles

F Congruence [4.1]

G Interpreting graphs and tables [11.1]

Angles are described by their size or degree measure. The different types of angle are summarised in the

following table:

Straight Angle

One complete turn.^12 turn.^14 turn.

One revolution= 360o. 1 straight angle= 180o: 1 right angle=90o.

Obtuse Angle

Less than a^14 turn. Between^14 turn and^12 turn. Between^12 turn and 1 turn.

An acute angle has size

between 0 oand 90 o:

An obtuse angle has size

between 90 oand 180 o:

A reflex angle has size

between 180 oand 360 o.

A ANGLES [4.1, 4.3]

(Geometry and graphs)

Revolution

Acute Angle Reflex Angle

Right Angle

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