Can someone help me?

52 cm radius = diameter = area = circumference = circumfer

Find the value of the variable and the length of each chord for #5 and #6.

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?