81, 84, 87.
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81, 84 and 87. And 90 if you want to count that
81, 84, 87.
There are 2 prime numbers between 80 and 90: 83 89
80 degrees is an acute angle because it is greater than 0 but less than 90 degrees
The multiples of five between sixty and ninety (inclusive) are 60, 65, 70, 75, 80, 85 and 90.