Line and Angles

Learning Outcomes

• Recognise angles.

• Recognise, compare and classify angles as acute, right, obtuse and reflex.

What is a LINE?

• A straight path in a plane that goes on forever in opposite directions

Example:

• line AB or line BA

What is a POINT?

• An exact location in space, usually represented by a dot

Example:

point A

ANGLE

LINE

ACUTE ANGLEan angle that is less than 90°

By using protactor

RIGHT ANGLEan angle that is 90° exactly

By using protactor

OBTUSE ANGLEan angle that is greater than 90° but less than 180°

By using protactor

REFLEX ANGLEan angle that is greater than 180°

By using protactor

http://www.amblesideprimary.com/ambleweb/mentalmaths/protractor.html

Ask student to look around them and ask them to describe something about the type of angle

Activity 1:Hunt for some angles in your

classroom

right

obtuseacute

Student will take a drawing paper and draw The Angle Finder:

Put the corner of your straw on the dot

Place the left side of your angle along this side

You need:

Straw

What to do:

1) Use the straw to match the angle in your classroom. When you find an angle, bend the straw to match it.

• Hold the bent straw up to the Angle Finder. It will tell you which kind of angle you have found.

• As you find each type of angle, list on the Angle Chart.

• Then straighten out the straw and start again

Angle Chart

RIGHT ACUTE OBTUSE

Corner of my notebook Space between my fingers

Clock hands at 10:30

Activity 2: Angles from A to Z

Angles are hiding everywhere even in the words you’re reading now. When two straight lines meet, they make an angle.

What to do:

1) Student will be given a handout that have work.

2) Ask them to take look at the letter in the word given.

3) Circle each angle they see in the lettets. Label whether it is right, acute or obtuse angle.

Example:

MATH

TIME

An acute angle is greater than 90⁰.

A) FALSE

B) TRUE

An obtuse angle is greater than 90⁰ but less than 180 ⁰.

B) FALSE

A) TRUE

A straight angle measure 180⁰.

B) FALSE

A) TRUE

A right angle does not measure 90 ⁰.

A) TRUE

B) FALSE

WRONG!!!!

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CONGRATULATION!!!!!

GOOD JOB!!!

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