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UNIT 31 Angles and Symmetry: Lesson Plans
STRAND I: Geometry and Trigonometry
UNIT 31: Angles and Symmetry
Lesson 31.3 Angle Geometry
CSEC Objective: angle geometry
Lessons Aims:
After this lesson, the student should:
understand and be able to apply the angle facts for points,
lines, triangles and quadrilaterals.
Prerequisite Knowledge: Angles, points, lines, triangles and quadrilaterals
Key Vocabulary:
Although this should again be familiar to students, weaker students
will struggle to have all the known results at their fingertips.
Teaching Notes:
Ensure that all students are familiar with the angle facts for point
( 360), line ( 180 ), angles in triangle, equilateral triangle ( 60)
and quadrilateral ( 360).
PP 31.2
 homework
Review answers
Review answers
Mental Test
Review answers
Closing activity
Lesson Plans: 
DS 31.2
ST 31.3, Q1 (some of)
ST 31.3, Q3 or Q4
ST 31.3, Q10
ST 31.3, Q8 and Q11
Relevant CSEC Questions:
MC Q1, Q2, Q4
RT Q4 and Q5
Glossary of Terms:
Angles at a Point Angles at a point will always add up to 360. It does not matter how
many angles are formed at the point – their total will always be 360.
Angles on a Line Any angles that form a straight line add up to 180 .
Angles in a Triangle The angles in any triangle 
add up to 180 .
Angles in an Equilateral Triangle In an equilateral triangle
all the angles are 60
and all the sides are the same length.
Angles in an Isosceles Triangle In an isosceles triangle two sides are the same length
and the two base angles are the same size.
Angles in a quadrilateral The angles in any quadrilateral add up to 360.
 CIMT and e-Learning Jamaica