Fill in the blanks with acute, obtuse, right or straight: (a) An angle whose measure is less than that of a right angle is ________________. (b) An angle whose measure is greater than that of a right angle is ________________. (c) An angle whose measure is the sum of the measures of two right angles is ________________. (d) When the sum of the measures of two angles is that of a right angle, then each one of them is ________________. (e) When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be ________________.