Identify a Triangle

Students recognize a triangle as a polygon with exactly 3 sides and 3 angles, regardless of its size or orientation.

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Real questions from this skill, graded here. No account, and nothing is saved.

Identify a Triangle

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

0 of 12

12 rungs. A star at the top.

Which number is the triangle?

Your answer:

How it is taught

0:00 of 3:15

A triangle has three straight sides.

It also has three corners.

Read it: Name a shape by its sides

Count the sides to name a shape. A pentagon and a hexagon can look alike until you count.

Start at one corner.
Go around once and count each side.
The number of sides gives the name.

A shape keeps its name when it is turned or flipped.

Every side ends at a corner, so a shape has as many corners as sides.

A square and a rectangle are quadrilaterals too.

Triangle, quadrilateral, pentagon, hexagon: count the sides, then name it.

Calling a shape a triangle because it has a point on top.

Count the sides. A shape with a point on top can be a pentagon.

2 triangles have how many sides in all? — 6. Each triangle has 3 sides: 3 + 3 = 6.

Is this shape a triangle?

Today we'll learn how to spot a triangle. Triangles are everywhere — in road signs, slices of pizza, and roofs of houses!

Here's a triangle. Let's count its sides and corners.

Grade 2 · A triangle has exactly 3 sides and 3 corners

A triangle has two special things: exactly three straight sides and three corners.

Let's count the sides. One.

Two.

Three! Three straight sides.

Now let's count the corners. One.

Two.

Three corners!

It doesn't matter if a triangle is big, small, or tipped sideways — if it has three straight sides and three corners, it's a triangle.

Three sides plus three corners equals a triangle. You did it!

Now you try. Count the corners of this triangle. How many corners?

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

Comes after

Identify Defining and Non-Defining Attributes of Shapes

Leads to

Identify Triangles, Quadrilaterals, Pentagons, and Hexagons

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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