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