Identify Triangles, Quadrilaterals, Pentagons, and Hexagons

Students identify and name triangles, quadrilaterals, pentagons, and hexagons by counting the number of sides and angles. Students understand these shapes as members of polygon families regardless of their orientation or exact size.

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Grade 2 · Shapes and Their Attributes · question 1 of 3

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12 rungs. A star at the top.

Ben sees shape flags at the campsite. Which flag is the triangle?

Your answer:

How it is taught

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A polygon is named by how many straight sides it has.

Turned shapes still keep their names.

Read it: Count sides, not tilt

A rectangle sits on the table. Someone turns it. Count the sides and the corners — not how it sits.

Count the sides of the turned shape: 4.
Count the corners: 4.
Four sides and four corners: it is still a rectangle.

Tilting a shape changes how it looks, not how many sides it has.

The name comes from sides and corners, not from sitting flat on a side.

A rectangle standing on a corner still has 4 sides and 4 corners.

Count the sides and the corners. Turning does not change the name.

Calling a turned rectangle a diamond because it no longer sits flat.

Count the sides. Four sides and four corners is still a rectangle.

A flat shape has 3 sides. It sits turned on 1 point. What is it called? — triangle. Turning a shape moves it; it does not rename it. 3 sides make it a triangle.

Naming a pentagon by counting its sides

Look at this flat shape. It has straight sides — that makes it a polygon. Let's name it by counting!

We start at one side... one.

Two.

Three.

Four.

And five! It has five sides — and five corners too.

This polygon with five sides is called a pentagon.

Grade 2 · Polygon families

Other polygons get their names the same way: three sides is a triangle, four is a quadrilateral, and six is a hexagon.

Count the sides, then say the name. You've got it!

Now you try. Pick this shape's name from the list. Choose the shape's name.

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics

Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal: 1 star — one skill mastered, every rung of its ladder climbed
Climbing now: Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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Standard

CCSS.2.G.A.1

Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces; identify triangles, quadrilaterals, pentagons, hexagons, and cubes

Grade 2

Quoted from the Common Core State Standards.

Where this sits

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What a star here means

A star here is the top of a twelve-rung ladder, in four blocks of equal length — three of facts and one of the skill used in a real question — where a right answer climbs one rung and a wrong one drops back to the start of the block, never below it. The star is kept for good. How we grade

All of Grade 2

This is one rung of 85 in Grade 2 mathematics, in the order they build on each other.

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