MCC.4.G.1-2 All About Triangles.

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Presentation transcript:

MCC.4.G.1-2 All About Triangles

What is a triangle? A triangle is a figure that has 3 sides and 3 angles.

How do we classify triangles? We classify triangles in 2 different ways: #1: Based on the length of the sides #2: Based on the angles

Length of Sides There are 3 different triangles based on length of sides: -Equilateral -Isosceles -Scalene

Equilateral Triangle An equilateral triangle has 3 sides that are the same length.

Isosceles Triangle An isosceles triangle has 2 equal sides.

Scalene Triangle A scalene triangle has no equal sides.

“My Many Triangles” Task Cut out each triangle. Sort these into groups according to their length of sides. Use a ruler to accurately measure.

Measurement of Angles There are 3 different types of triangles based on measurement of angles: -Acute -Obtuse -Right

Acute Triangle All angles are less than 90°

Obtuse Triangle Has one angle greater than 90°

Right Triangle Has a right angle (90°)

“My Many Triangles” Task Sort these into groups according to their angles. Use your index card to accurately measure the angles.