This is What We Have Learned 2

4th Grade AMP 22-23

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Topic 8 and 12 Loading...

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AMP 4th GradeLoading...

BY:JOSE CARLOS, SANTIAGO ORTIZ, LEANDRO MAURICIO AND JIMENA ZAPATA.Loading...

Topic 8Loading...

8 - 1 Basic Geometric Ideas8 - 2 Measuring and Classifying Angles

8 - 3 Polygons

8 - 4 Triangles

8 - 5 Quadrilaterals

8 - 6 Problem Solving: Make and Test Generalizations

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8 - 1 Basic Geometric Ideas

Points and lines are basic geometric ideas. Lines are sometimes

described by relationships to other lines.

described by relationships to other lines.

If you see a line crossing another line it means they intersect.

In this example you can se line U intersects line P.

In this example you can se line U intersects line P.

If you see this time a dot it means it is point (a letter or number).

In this example point J.

In this example point J.

Parallel lines can’t intersect because parallel means extending in the same direction, but without meeting.

8-2

Measuring and Classifying Angles

Measuring and Classifying Angles

Right

In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or \pi /2 radians corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.

Acute

An acute angle is an angle that is

**less than 90°**, and these angles can be measured using a protractor.Obtuse

In Mathematics, “an obtuse angle is an angle which is greater than 90° and less than 180°”. In other words, an obtuse angle is between a right angle and a straight angle.

Straight

A straight angle is a 180° angle.

8-3 polygons

A polygon is a closed plane figure made up of line

segments. Common polygons have names that tell

the number of sides the polygon has.

segments. Common polygons have names that tell

the number of sides the polygon has.

Examples:

Quadrilateral

Octagon

Hexagon

8-4 triangles

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Examples:

equilateral triangle

Scalene triangle

Acute triangle

Right triangle

8-5 quadrilaterals

Parallelogram: a quadrilateral with both pairs of opposite sides parallel and equal in length.

Rectangle: a parallelogram with four right angles.

Rhombus: a parallelogram with all sides the same

length.

square: a rectangle with all sides the same length.

trapezoid: a quadrilateral with only one pair of parallel sides.

Rectangle: a parallelogram with four right angles.

Rhombus: a parallelogram with all sides the same

length.

square: a rectangle with all sides the same length.

trapezoid: a quadrilateral with only one pair of parallel sides.

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