W11.5

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W11.5

Back

Hint:

You don't need a protractor to answer this question. What is the name of a 100° angle? Is it more or less than a right angle?

Is it a lot more than a right angle or just a little bit?

For the direction now, visualise (or look at) a clock, the hands move 'clockwise'. In this exercice you need to measure the angle from the vertical line (facing North) and go 'anti-clockwise', the opposite direction than a clock's hands.

Front

Yeah! The correct answer is B.

While we are here, what is the name of this angle?

Back

It is a right angle

It measures 90°

There are not very present in nature but us; human, we use them all the time and put them everywhere.

There is special symbol to represent it, it is this little tiny square, all the other angles are represented by arcs.

Front

and those ones?

Back

Obtuse angles!

More than 90° but less than 180°.

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Back

Reflex angle

waouw so flex the reflex!

More than 180° but less than 360°

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Back

straigth angle

or

flat angle

= 180°

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Back

Revolution angle

or

full turn

= 360°

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Back

and finally:

acute angle

the smallest, so cute, the acute angle.

from 0° to 89°