Triangles

Geometry

NC.4.G.2 – Classify quadrilaterals and triangles based on angle measure, side lengths, and the presence or absence of parallel or perpendicular lines.

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Triangles Video

Triangles

[chorus]

Triangles, 3 sides, 3 angles.

Triangles, 3 sides, 3 angles.

Triangles, 3 sides, 3 angles.

Triangle is a polygon, triangle is a polygon.

 

[verse]

An acute triangle has 3 angles

that are less than 90 degrees.

An obtuse triangle has 3 angles

but 1 angle is more than 90 degrees.

A right triangle has 3 angles

but 1 angle equals 90 degrees.

An equilateral triangle has 3 sides,

and all 3 sides are equal.

Isosceles triangle has 3 sides,

but only 2 of those sides are equal.

A scalene triangle has 3 sides.

All 3 sides have different sizes.

 

[chorus]

Triangles, 3 sides, 3 angles.

Triangles, 3 sides, 3 angles.

Triangles, 3 sides, 3 angles.

Triangle is a polygon, triangle is a polygon.

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