question_answer 19)

Write down the measures of (a) some acute angles. (b) some obtuse angles, (give atleast two examples of each)

Answer:

(a) We know that, the measure of an acute angle is always less than \[{{90}^{o}}\]. So, \[{{45}^{o}},\,{{50}^{o}},\,{{55}^{o}},\,{{60}^{o}},\,{{65}^{o}}\] all are acute angles, (b) We know that the measure of an obtuse angle, is always, greater than \[{{90}^{o}}\] but less than \[{{180}^{o}}\]. So, \[{{120}^{o}},\,{{125}^{o}},\,{{135}^{o}},\,{{140}^{o}}\] all are obtuse angles.