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Any angular size between 0 and 90 degrees.

An OBTUSE angle is one whose size is between 90 & 180 degrees.

A REFLEX angle is one whose angle is between 180 & 360 degrees.

NB To correct your English grammar . The question should read ' What size is an acute angle'.

When the noun following the indefinite article 'a', begins with a vowel 'a,e,i,o,u'. then the indefinite article is 'an'. In this case it is 'an acute', NOT 'a acute'.

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lenpollock

Lvl 16
1y ago

What else can I help you with?