Virginia SOL Math / Grade 2 / Measurement & Geometry

2.MG.4

Plane & Solid Figures

What you'll learn

  • Identify and describe plane figures such as triangle, square, rectangle, and circle
  • Identify and describe solid figures such as sphere, cube, and cylinder
  • Compare and contrast plane and solid figures

Words to know

Plane figure —
a flat shape, like a square or circle
Solid figure —
a shape that takes up space, like a cube
Side —
a straight edge of a plane figure
Vertex —
a corner where sides or edges meet
Face —
a flat surface of a solid figure

Why it matters Naming shapes helps us describe the world around us, like signs, balls, boxes, and cans.

Worked examples

Model ItI do

How many sides and vertices does a triangle have?

A triangle is a plane figure with 3 straight sides. Where two sides meet is a vertex, and a triangle has 3 vertices. So a triangle has 3 sides and 3 vertices.

Try It TogetherWe do

Is a ball a plane figure or a solid figure? What is its shape name?

A ball takes up space and is not flat, so it is a solid figure. Its shape name is a sphere.

Now YouYou do

How many faces does a cube have?

Picture a box and count each flat surface. Check your answer in the back of this chapter.

Practice

Mastered 0 of 11

Warm-up

Ease in with the basics.

  1. 1.How many sides does a triangle have?

  2. 2.Is a circle flat or does it take up space like a ball?

  3. 3.What is the name of a shape that looks like a box with square faces?

On Level

The core Quick Check from the book.

  1. 1.How many sides does a square have?

  2. 2.What is the name of a can shape?

  3. 3.Is a circle a plane figure or a solid figure?

  4. 4.How many vertices does a rectangle have?

  5. 5.Name a solid figure that can roll.

Challenge

Stretch your thinking.

  1. 1.How many faces does a cube have?

  2. 2.How many vertices (corners) does a triangle have?

  3. 3.Name a solid figure that has no vertices and can roll in every direction.