How_To_Be_Good_At_Math
GEOMETRY • NAMING POLYGONS 219 5 sides and 5 angles 4 sides and 4 angles 9 sides and 9 angles 8 sides and 8 angles Regular nonag ...
220 GEOMETRY • CIRCLES Circles A circle is a 2D shape, made from a curved line that goes all the way round a point at the centre ...
GEOMETRY • CIRCLES 221 Answer on page 320 Chord A line between two points on the circle’s circumference that doesn’t go through ...
222 GEOMETRY • 3D SHAPES WIDTH LENGTH 3D shape Three-dimensional, or 3D shapes, are shapes that have length, width, and height. ...
GEOMETRY • 3D SHAPES 223 Face The surface of a 3D object is made of 2D shapes called faces. Faces can be flat or curved. Edge An ...
224 GEOMETRY • TYPES OF 3D SHAPE Types of 3D shape 3D objects can be any shape or size, but there are some that you will come ac ...
GEOMETRY • TYPES OF 3D SHAPE 225 All the faces are squares Faces are squares Faces are equilateral triangles Faces are equilater ...
226 GEOMETRY • PRISMS Prisms A prism is a special kind of 3D shape. It is a polyhedron, which means that all its faces are flat. ...
GEOMETRY • PRISMS 227 TRY IT OUT Spot the non-prism Which of these shapes is not a prism? Check to see if it has parallel faces ...
228 GEOMETRY • NETS Nets A net is a 2D shape that can be cut out, folded, and stuck together to make a 3D shape. Some 3D shapes, ...
GEOMETRY • NETS 229 Cylinder A cylinder’s net is formed from just two circles and a rectangle. Cuboid The net of a cuboid is mad ...
230 GEOMETRY •^ ANGLES Angles An angle is a measure of an amount of turn, or rotation, from one direction to another. It is also ...
GEOMETRY • DEGREES 231 Degrees We use units called degrees to precisely describe an amount of turn, which is how we measure the ...
232 GEOMETRY •^ RIGHT ANGLES Right angles Right angles are important angles in geometry. In fact, they are so important they get ...
GEOMETRY • TYPES OF ANGLE 233 Types of angle As well as the right angle, there are other important kinds of angle that we name a ...
234 GEOMETRY • ANGLES ON A STRAIGHT LINE Imagine that your line made a stop on the way to the half turn, creating an extra line. ...
GEOMETRY • ANGLES AT A POINT 235 We know that if we turn a line all the way round to where it started, it makes a full turn, whi ...
236 GEOMETRY •^ OPPOSITE ANGLES Opposite angles When two straight lines cross, or intersect, they create two pairs of matching a ...
GEOMETRY • OPPOSITE ANGLES 237 d e a c b Finding missing angles When two lines intersect, if we know the size of one angle, we c ...
238 GEOMETRY •^ USING A PROTRACTOR Using a protractor We use a protractor to draw and measure angles accurately. Some protractor ...
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