For a system of vector

Which expression converts 45 degree to radians

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok