• MA.3.M3G1 - Students will further develop their understanding of geometric
figures by drawing them. They will also state and explain their properties.
• MA.3.M3G1.a - Draw and classify previously learned fundamental
geometric figures and scalene, isosceles, and equilateral triangles.
• MA.3.M3G1.b - Identify and compare the properties of fundamental
• Geometry is a kind of mathematics that
deals with shapes and figures. Geometry
explains how to build or draw shapes,
measure them, and compare them.
People use geometry in many kinds of
work, from building houses and bridges to
planning space travel.
• Points, lines, and angles are basic terms of
• A point is usually represented by a dot.
• A line is an object that extends without end in
both directions. It has arrow heads on both
• A line segment is a part of a line with two end
• A ray has one end point and half of a line.
• Two rays with the same end point form an
• If the rays are the two halves of a single line, the
angle is called a straight angle.
• A straight angle can be thought of like a book
opened flat on a desk.
• An angle opened half that far is called a right
• Angles are measured in degrees.
• A right angle measures 90 degrees.
They can be found in many different
shapes and objects.
• Acute angles are smaller than a right
angle. (0-89 degrees)
• Obtuse angles are larger than a right
angle but smaller than a straight angle.
• Geometry: Right Angles. [Video]. Retrieved October 24,
2010, from Encyclopædia Britannica Online School
• Geometry. (2010). In Britannica Elementary
Encyclopedia. Retrieved October 25, 2010, from
Encyclopædia Britannica Online School Edition: