By Robert Haese
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Additional info for Basic Skills Mathematics Year 7
Parallel and perpendicular lines In the figure AB is parallel to DC. We write this as AB k DC. A B D C Perpendicular means at right angles to . Also AD is perpendicular to DC. We write this as AD ? DC. k reads is parallel to ? , write statements about the following figures: a b P Q d R L K N M A D e B c H C P Q S R I K f W X Z Y 6 Draw the figures from these instructions. A freehand labelled sketch is needed in each case. a AB is 4 cm long. BC is 3 cm long. AB ? BC. b PQ is 5 cm long. RS is 4 cm long.
B Measure angles ABC, BCA, CAB using a protractor. C 5 cm A There are 6 parts to a triangle. Can you name them? o ” 3 With centre A, draw an arc of a circle of radius 5 cm. Choose any two points B and C on this arc (not too close together). Join AB, BC and AC. B A a What type of triangle is ABC? ) b Measure angles ABC and ACB using a protractor. ) d an isosceles triangle with equal sides 4:4 cm long and third side 6 cm long. A Bisecting an angle Aim: VIDEO CLIP To bisect angle ABC. B Step 1: With centre at B, draw an arc which cuts BA at P and BC at Q.
A freehand labelled sketch is needed in each case. a AB is 4 cm long. BC is 3 cm long. AB ? BC. b PQ is 5 cm long. RS is 4 cm long. RS k PQ and RS is 3 cm from PQ. c ABCD is a quadrilateral in which BC k AD and AB ? AD. J 45 46 SHAPES AND SOLIDS (CHAPTER 3) Unit 20 Constructing a triangle and bisecting angles Constructing a triangle VIDEO CLIP To construct a triangle with sides 4 cm, 3 cm and 2 cm long. Aim: Step 1: Step 2: Step 3: Step 4: Draw a line segment the length of one of the sides (say AB).
Basic Skills Mathematics Year 7 by Robert Haese