angle

o Name: Prachi A. Parab

o Roll No: 46

o Class: B.Ed (2014-15)

o Methods: Economics & Mathematics

o Subject: Mathematics

o Std: 6

o Unit: Angle

Pandit Rajpati Mishra College Of Education & Research

Contents• Introduction

• Rays, Vertex & Angle

• Naming an Angle

• Measuring an Angle

• Interior and exterior of an Angle

• Types of Angles

Let’s See Who Can Answer This

• Name the different types of Shapes.

• Split the word “TRIANGLE” in 2 parts.

When two RAYS meet at a point(VERTEX), an ANGLE is formed.

MEASURING AN ANGLE

INTERIOR & EXTERIOR OF AN ANGLE

“Hi! We’re the Angles, we’re one family, but all very different, so let us tell you a bit about ourselves!”

TYPES OF ANGLES

This is Obtuse. He’s the

husband of the family. He’s

bigger than Right and

Acute . He’s always inside,

and he always measures

between 90° and 180°

(depending on how much

dinner he’s eaten!)

MR. OBTUSE ANGLE

OBTUSE ANGLE

Mrs. Right Angle

This is me. I’m Mrs.

Right Angle. I always

measure 90°, my

favourite shape is a

square, and what’s

more, no matter what

my husband tells you,

I’m always right!

RIGHT ANGLE

Baby Acute Angle

This is baby Acute angle.

Isn’t he cute?! He loves a

hug, and always has his

arms out for cuddles! He’s

the smallest of the family,

measuring less than 90°.

ACUTE ANGLE

RECAPITULATION• When 2 rays meet at a point (Vertex), an Angle is formed.

• We name angles using the vertex and other letters around it and the

vertex letter always goes in the center.

• Measuring unit of an angle is DEGREE

• When the points are on the arms of the angle they belong to the angle

whereas when they are in the interior and exterior of the angle they

don’t belong to the angle.

• Acute angle measures less than 90 degrees, Right Angle measures

exactly 90 degrees, Obtuse angle measures more than 90 degrees and

less than 180 degrees.

So, Today We Learnt About

Rays, Vertex & Angle

How to measure an

angle

How to name an angle

Interior & Exterior of an angleAcute, right

and obtuse angles

Evaluationo Which points below are in the interior and exterior of the

angle?

o Each picture below represents an angle. Name the angle.

Assignment: Identify, Name & Measure the

ANGLES below

References

• Mathematics text book grade 6

• Images- www.google.com

• The Angles Family (Georgina Reynolds)

http://www.primaryresources.co.uk/maths/mathsE7.htm

• http://www.teachingideas.co.uk/maths/contents_angles.htm