Angles and Triangles

Angles and Triangles

Triangle A geometric shape which has 3 angles and 3 sides

If you add the 3 angles they will always equal 180o

There are six ways to describe triangles defined by their angles, and by the relative length of their sides

By angle> obtuse, acute, and right

A triangle where the largest angle is exactly 90-degree angle is a is a right triangle. A triangle with the largest angle that is still less than 90 is an acute triangle A triangle that has an angle greater than 90 degrees, this is an an obtuse triangle

Triangles can also be defined by the length of their sides>

When all three sides are the same length, each angle is 60 degrees this is an equilateral triangle

When two of the sides of a triangle are the same it's called an isosceles triangle

When a triangle has no sides that are the same (all different or unique

lengths and angles) is a scalene triangle

Protractors > used to measure angles Angles are described similar to triangles Right, Obtuse and Acute Angles are also rays- the "lines" have a starting point but continue

infinitely. So if your angle is too short to read using the protractor, you can "extend the line"

Puzzler using angles

If triangles have the same angles, they can still have different sizes. These pairs of triangles are congruent

If you know the measurements of one triangle, you can calculate another triangle WITH THE SAME ANGLES by ratios

Engineers often use this to measure things that are too tall to measure. There are several ways to do this, some with math, and some with special equipment

We are going to focus on one kind of triangle...

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