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Features

Count the sides and corners (vertices) of a triangle, a square, a rectangle, a trapezoid, a hexagon and a circle, and write each name from a word bank
Circle every real triangle and every rectangle in a field of shapes that are big and small, turned and colored, next to look-alikes with a gap, a curved side, a rounded corner or the wrong number of sides
Decide whether two shapes are still the same shape when the color, size or turn changes, then circle true or false
Draw shapes from clues on dot paper and name them
Finish by putting shapes together: circle the two shapes that make a bigger one, find how many triangles make a hexagon and count the shapes in a robot
Every page in color and in black and white
Answer keys included

Skills Covered

Count the sides and corners of a shape
Name triangles, squares, rectangles, trapezoids, hexagons and circles
Tell a real triangle or rectangle from a look-alike

Know that color, size and turn do not change a shape
Draw shapes on dot paper from clues
Put two shapes together to make a new shape

How to Use This Pack

Five pages about what makes a flat shape the shape it is. Page 1 starts with a worked triangle: students count the sides and the corners of a rectangle, a circle, a hexagon, a square and a trapezoid, then write each name from the word bank. A circle has 0 sides and 0 corners. On page 2 students circle every triangle in a field of twelve shapes, then every rectangle in a field of ten. The real ones are big and small, turned and long and thin; the look-alikes have a gap, a curved side, a rounded corner, four sides or a slant. Page 3 shows six pairs of shapes and asks whether both are squares, triangles, hexagons, trapezoids, rectangles or circles, then four true or false sentences about turning, size, curved sides and gaps. Page 4 gives clues such as 3 sides and 3 corners, or 4 square corners with 2 long sides and 2 short ones; students draw each shape on dot paper and write its name. Page 5 puts shapes together: circle the two shapes that make a square, a rectangle, a circle and a hexagon, find how many triangles make a hexagon, and count the triangles, squares, rectangles and half-circles in a robot.

In the Classroom

Before page 1, pass around paper shapes and have students trace each side with a finger and tap each corner as they count. For page 2, hold up a paper triangle, turn it upside down and ask whether it is still a triangle; then cut a slit in one side and ask again. Pattern blocks make page 5 hands-on: let students build the square, the rectangle and the hexagon from two pieces before they circle, and fill a hexagon with green triangles.

At Home

Go on a shape hunt: a door is a rectangle, a clock is a circle, a slice of sandwich cut corner to corner is two triangles. Ask how many sides and corners each one has. Cut a paper square in half two different ways and see which two shapes you get.

Tips for Success

Tap each corner as you count it, so none is counted twice
A circle has no straight sides and no corners
A triangle has 3 straight sides and is closed, with no gaps
Turning a shape, coloring it or making it bigger does not change its name
A square on its corner is still a square

Common Core Standards Alignment

This pack supports the following Common Core State Standards for Mathematics:

K.G.A.1 Use shape names for everyday objects, and tell where things are with position words like over, under, next to and behind.
K.G.A.2 Name shapes correctly even when they are turned, tilted, bigger or smaller.
K.G.A.3 Tell whether a shape is flat (two-dimensional) or solid (three-dimensional).
1.G.A.1 Separate the features that define a shape (three sides) from ones that do not (color, size, turn), and build or draw shapes with them.
1.G.A.2 Combine flat shapes (such as trapezoids and half-circles) or solids (such as cubes and cones) into a new shape, then build more shapes from it.
2.G.A.1 Draw and spot shapes with given features, like a number of angles or faces, and name triangles, quadrilaterals, pentagons, hexagons and cubes.

Flat Shapes: Sides and Corners

1st Grade

What makes a flat shape the shape it is: its sides and corners. Students count sides and corners, find real triangles and rectangles among look-alikes, draw shapes from clues on dot paper and put shapes together.

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What’s Included

5 worksheets in color and in black and white, with answer keys (15 pages)
Sides and corners of six shapes, with a word bank for their names
Real triangles and rectangles to find, and what does and does not change a shape
Shapes to draw from clues on dot paper, and shapes to put together

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Free to print and share

This worksheet is free to download, print, copy, and hand out in your classroom or at home. You do not need to create an account, and there are no watermarks on the PDF.