An angle of 86 degrees is an acute angle.
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An acute angle.
86 degrees, like any angle of less than 90 degrees, is an acute angle.
90-4 = 86 degrees.
Exterior angle = 360/45 ie 8o so interior angles are 172o. Check: ((90 - 4) x 90)/45 = 86 x 2 = 172.
5% of 86 kg= 5% * 86= 0.05 * 86= 4.3 kg