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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The question appears to relate to the angles of a triangle. 1) If angle 3 is acute then the other two angles can also be acute. In the case of an equilateral triangle all three angles are equal and acute. 2) If angle 3 is acute and one other angle is obtuse then the remaining angle is acute. 3) If angle 3 is acute and one other angle is a right angle then the remaining angle is acute.
No, but 75 degrees is an acute angle.
Yes . Triangle have right acute and obtuse angle except compelete angle.
An acute angle
yes because if you flip the acute angle it is possibe