## Making Two-dimensional Shapes

#### Aligned To Common Core Standard:

**Grade 1** - 1.G.2

What Are Two-dimensional Shapes? From your water bottle to your bedtime storybook, you are surrounded by objects of different shapes and sizes. Understanding the types of shapes is the most basic step in learning geometry. Two-dimensional shapes are the ones that have a length and breadth but no depth. A 2D shape can have any number of sides, and each side can either be a straight line or a curved line. All 2D shapes are polygons except for circles and ellipses. The basic two-dimensional shapes include; Circle- It is a closed 2D shape which has a center. The distance of the center to any point on the edge of the shape is equal and known as the radius. Triangle- It is a three-sided triangle that has three sides with three vertices. The sum of all internal angles of a triangle is equal to 180°. There are three types of triangles, including equilateral, scalene, and isosceles. Square- It is a four-sided 2D shape that has four equal sides. All angles in a square are at 90°, and even the diagonals bisect each other at 90°. Rectangle- It is a four-sided shape with equal opposite sides. All angles in this shape are equal to 90°. Other 2D shapes include pentagons, octagons, and hexagons. All of these have more than four sides.

- 2 Dimensional Shapes Step-by-step
Lesson- This is a great starter for symmetry skills too. Piece together the
shapes by using parts of the shapes.

- Guided Lesson - All of these
questions each have two parts. We have you construct a shape for
us.

- Guided Lesson Explanation
- We show students how to match up missing quarters and halves.

- Practice Worksheet - The practice
sheet has a number of unique parts of shapes and shapes alike.

- Matching Halves Worksheet - See which half would fit in each shape.
- Counting Corners and Sides Guided Lesson 1 - The hexagon comes to play and wants his corners and sides counted.
- Counting Corners and Sides Guided Lesson 2 - Same thing, but with a pentagon now.
- Recognizing Two-dimensional Shapes Step-by-step Lesson 1 - We play name the shapes so that we can work toward making them.
- Recognizing Two-dimensional Shapes Step-by-step Lesson 2 - My cousin made this one. She's being living in Toronto for three years.
- Counting Corners and Sides of Shapes Lesson - A simple illustration of sides versus corners.
- Counting Corners and Sides of Shapes Worksheet 1 - This is called the shape line up.
- Finding and Recognizing Two-dimensional Shapes Worksheet 2 - You can definitely find a lot more that two shapes in this race car.
- Putting Two Together To Make One Worksheet 3 - Which two parts make the one shape?

#### Guided Lessons

This is a very visual and spatial topic.

#### Practice Worksheets

Geometry skills later in life hinge on understanding the basic vocabulary here.