4. Arme e efetue coloque nos espaços peracões. a) 38^circ 20'+51^circ 40'=underline ( ) 90^circ -40^circ 20'45''=underline ( ) b) d 45^circ 20'25''-30^circ 30'30''= 10^circ 45'45''+20^circ 20'45''= 27^circ 22'8'':4=underline ( ) e) f) 25^circ 12'15''times 5=underline ( ) g) 15^circ 20':4=underline ( ) h) 32^circ 25'times 4=underline ( )

a) <br />$38^{\circ }20' + 51^{\circ }40' = 89^{\circ }60' = 90^{\circ }$<br />$90^{\circ } - 40^{\circ }20'45'' = 49^{\circ }39'15''$<br /><br />b) <br />$45^{\circ }20'25'' - 30^{\circ }30'30'' = 14^{\circ }49'55''$<br />$10^{\circ }45'45'' + 20^{\circ }20'45'' = 31^{\circ }5'30''$<br />$27^{\circ }22'8'' \div 4 = 6^{\circ }40'42''$<br /><br />c) <br />$25^{\circ }12'15'' \times 5 = 125^{\circ }12'15''$<br /><br />d) <br />$15^{\circ }20' \div 4 = 3^{\circ }50'$<br />