Write 25 times 10^6 in standard form

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180

Can someone me with these two circle theorem questions asap?