What is the name of the study of shapes and angles?
Geometry is the study of shapes, angles, and lines. Geometry helps us understand the world around us. We use geometry to measure and build things.
Lines: A line is a straight path that goes on forever in both directions and has no thickness. Angles: An angle is formed when two rays or line segments begin at the same point and extend in different directions. Triangles: A triangle is a three-sided polygon with three straight sides that are joined together.
A triangle can have more than three angles. A triangle with four or more angles is called an 'exterior angle'. The angles of an equilateral triangle are all 60°. The angle sum of a convex pentagon is 540°.
Did you know?
What shapes can you think of that have four sides?
How might you be able to tell if two shapes are the same?
What have you learned about shapes with four sides?
What strategies can you use to figure out how many sides a shape has?
Brain break: Draw a balloon holding a flower.
What is a shape with three sides called?
What kind of angle is less than 90 degrees?
- Right angle
- Obtuse angle
- Acute angle
Which shape has six equal sides and six equal angles?
What do you call the distance around a circle?
What do you call the longest side of a right triangle?
- Opposite Side
- Adjacent Side
- None of these
Work together in pairs: What shape has four sides and four angles?