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P1 Maths | Plane Shapes Lesson Guide for Tutors | Triangle, Square, Rectangle, Circle
Pupils can name the shapes but cannot say how many sides they have. This lesson makes pupils walk a finger around the edge so that side and corner become things they can feel.
Objectives — Pupils can: 1) walk a finger around the edge of a shape and count its sides; 2) state that a triangle has 3 sides and 3 corners, a square and a rectangle have 4 and 4, and a circle has neither; 3) tell a square from a rectangle using four equal sides; 4) count how many of each shape appear in one picture.
01 Prerequisites (3-minute check)
If any of these fails, fix it before the lesson starts.
| Skill | Quick check | Pass mark |
|---|---|---|
| Counting to 4 | count 3 objects, count 4 objects | the counting behind sides and corners |
| Comparing lengths | is this side longer than that one | telling a square from a rectangle |
02 Lesson flow (35 minutes)
| Time | Stage | Tutor does | Student does |
|---|---|---|---|
| 0-5 min | Feel the shape | what shape is this | triangle |
| 5-13 min | Walk the edge | count sides, then corners | 3 sides, 3 corners |
| 13-21 min | Square against rectangle | are all four sides equal | square yes, rectangle no |
| 21-30 min | The circle | any straight side or corner | none, the finger never stops |
| 30-35 min | Exit check | three questions | all correct to pass |
03 Teaching script (read it out)
Scene 1: Act 1: Walk a finger around the edge
Do not open with the sentence a triangle has three sides. Hand out a card triangle and ask the pupil to run a finger slowly along the boundary until it returns to the start. Each time the finger turns a corner, stop and tap. The finger stops three times, so there are three corners and three sides. Repeat with a square card and the finger stops four times. The hand now remembers that a turn means a corner, so the pupil no longer has to memorise a sentence.
Tutor line: run your finger along the edge, and every time you turn, stop and tap. How many taps did you make?
Scene 2: Act 2: Square and rectangle both have four sides
Pupils call every four-sided shape a square, because both have four sides, four corners and look boxy. Put two card shapes side by side. A square has four equal sides; a rectangle has two long and two short. Ask the pupil to measure with a paper strip: in the square the across side matches the down side, in the rectangle the across side is clearly longer. Use the phrase all four the same as the test, not bigger or smaller.
Tutor line: both have four sides. The difference is the sides: four the same makes a square, two long and two short makes a rectangle.
Scene 3: Act 3: A circle has no straight side and no corner
Give the pupil a circle card and use the same finger walk. This time the finger never stops, because there is no turn, so there is no corner. Say plainly that a circle cannot be described as having four sides or four corners, because its boundary is curved. Then mix circles, triangles and squares in a bag and ask the pupil to feel and name each one with eyes closed, sorting them into has a corner and has no corner.
Tutor line: you cannot feel a turn on a circle, so it has no corner. On a shape with corners your finger must stop.
04 Question types and worked steps
| Type | Example | Steps | Answer |
|---|---|---|---|
| Naming | look, name it, say the number of sides, say the number of corners | never accept the name alone | |
| Counting sides and corners | pick a starting corner, walk the edge once, tap at every turn | one full circuit only | |
| Square against rectangle | measure all four sides; four equal means square, two long and two short means rectangle | eyes alone are not enough | |
| Counting shapes in a picture | circle each shape, tick it, write the totals, add them | never count the same shape twice |
Sanity check (teach this): A side is counted only after one full circuit; a square has four equal sides and a rectangle has two pairs of equal sides; a circle has no straight side and no corner, so it must never be written as four sides.
05 Independent practice (3 questions)
| Question | Answer | What to watch |
|---|---|---|
| How many sides and corners does a triangle have? | 3 sides and 3 corners | walk the edge, three stops |
| What do a square and a rectangle have in common? | both have 4 sides and 4 corners | they differ in side lengths |
| Does a circle have a corner, and why? | no, the edge is curved so there is no turn | the finger never stops |
| A picture has 3 triangles, 2 squares, 1 rectangle and 2 circles. How many shapes in total? | 8 | 3 plus 2 plus 1 plus 2 is 8 |
| What shape can you make with 4 straws of the same length? | a square | four equal sides |
06 Common mistakes and what to say
| Mistake | Student writes | Say this |
|---|---|---|
| Calling a rectangle a square | any boxy shape becomes a square | check whether the across side and the down side are the same length |
| Counting a side twice | the shape ends up with five sides | start at one corner, go round once, stop when you get back |
| Believing a circle has corners | pointing to four corners on a circle | did your finger ever stop? no stop means no corner |
| Missing shapes in a picture | counting a joined figure as one shape | circle each shape first, then count the ticks |
07 Homework (paper, section and question numbers)
- Independent practice in this chapter (questions 1 to 5 above) — questions 1 to 3: say the sides and corners; 4 to 5: counting and building shapes
- Primary maths chapter index (related chapters at this level) — question 6: find three triangle objects and three circle objects at home and draw them
08 Exit check (last 5 minutes)
| Question | Answer | Decision |
|---|---|---|
| How many sides and corners does a square have? | 4 sides and 4 corners | wrong: redo the finger walk |
| Does a circle have a corner? | no | wrong: feel the curved edge again |
| A shape has four equal sides. What is it? | a square | wrong: redo the square and rectangle comparison |
09 Tutor FAQ
Should the word polygon be introduced in P1?
No. Four shapes plus the words side and corner are enough; extra vocabulary buries the hands-on work.
What if a pupil insists a circle has four corners?
Do not argue. Ask for one finger walk. A finger that never stops is stronger evidence than ten explanations.
How far should composite figures go?
In P1 only count how many of each shape are present. Overlapping and splitting figures wait until P3 and P4.
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A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.