Triangles are classified based on two different characteristics: Whether or not the triangle has equal sides and; The size of the angle. Classification Based on Side Length Scalene This type of triangle has no equal sides. Isosceles This type of triangle has 2 equal sides. Equilateral All sides of the triangle are equal. Note:…...
Tag: Geometry Grade 4
Properties of a Quadrilateral
As we reviewed in a previous post, there are many different types of quadrilaterals. In this post we will be looking at the individual properties of each. Square All angles are equal at 90 degrees All sides are of equal length Opposites sides are parallel The diagonals bisect each other at 90 degrees (you…...
Quadrilateral Overview
Note the beginning of the word quadrilateral is quad and means 4. In this post we will look at shapes that have 4 sides, 4 vertices and four angles. The image above contains quadrilaterals only. All have the shapes have 4 sides, vertices and angles. Quadrilaterals can be divided into groups based in properties of quadrilaterals.…...
Axis of Symmetry
When referring to symmetry, we mean that one shape is exactly like another when it is flipped, slid/folded, or turned over another. When speaking specifically to shapes, you may hear terms such as axis or symmetry or lines of symmetry. The line through the image is referred to as the axis of symmetry if and…...
Parallel and Perpendicular Lines
Perpendicular Lines These are two lines that intersect at a right angle. In the image above we see that the two lines intersect. If any of the angles at the point of intersection is equal to 90 degrees then all other angles at the point of intersection would be equal to 90 degrees. We see…...
Acute, Right and obtuse Angles
Acute Angle These angles are smaller than 90 degrees. Right Angle Right angles are equal to 90 degrees. Obtuse Angle An obtuse angle is greater than 90 degrees. Read more →...
Angle Measurement and Circle Arcs
Typical measure for each angle is in degrees. The term comes from a circle. It is understood that there are 360 degrees in a circle. There is no definite answer when it comes to determining the origin of this 360 degree figure, however it is thought to refer to the days of the year. To…...
Introduction to Angles
An angle is more commonly defined as two rays with a single vertex. Note that the vertex of the two rays is also the vertex of the angle. Rays and formed the angle at the vertex A. In order to properly refer to angles we give them names, just like we name lines, rays etc.…...
Introduction to Geomerty
Just for a bit of history, Euclid of Alexandria, was a Greek Mathematician and is known as the Father of Geometry. The basics of all geometry taught today can be traced back to him. Discussed in this post are explanations of essential principles for further education in geometry. As we move on, remember that you…...
Learn about Angles (Video)
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Types of Angles (Video)
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Geomerty Worksheet – 30 Questions
This is not timed. Review your notes before attempting. Do your best! 1. What is smaller than a right angle? a. acute angle b. obtuse angle c. supplementary angle d. complementary angle 2. If two angles sum to 180 degrees, the angle is termed? a. obtuse angle b. acute angle c. supplementary angle d.…...