Express the following in terms of a right angle.

a) ${60}^{°}$

b)${70}^{°}15\text{'}$

c) ${68}^{°}17\text{'}25"$

a) ${60}^{°}$

${60}^{°}$= $\frac{60}{90}$

=$\frac{2}{3}$right angle

b)${70}^{°}15\text{'}$

${70}^{°}15\text{'}$=$70+\frac{15}{60}=70+\frac{1}{4}=\frac{281}{4}=70.25°$

=$\frac{70.25}{90}$

=0.7805 right angle

c) ${68}^{°}17\text{'}25"$

${68}^{°}17\text{'}25"$=$68+\frac{17}{60}+\frac{25}{3600}$=$68.29°$

=$\frac{68.29}{90}$

=0.7587 right angle