How do you condense #log(pi) + 2log r#? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer Alan P. Jun 1, 2016 #log(pi)+2log(r)=color(green)(log(pir^2)# Explanation: Remember #color(white)("XXX")a*log(b) = log(b^a)# and #color(white)("XXX")log(c)+log(d)=log(c*d)# Therefore #log(pi)+2log(r)# #color(white)("XXX")=log(pi)+log(r^2)# #color(white)("XXX")=log(pir^2)# Answer link Related questions What is the common logarithm of 10? How do I find the common logarithm of a number? What is a common logarithm or common log? What are common mistakes students make with common log? How do I find the common logarithm of 589,000? How do I find the number whose common logarithm is 2.6025? What is the common logarithm of 54.29? What is the value of the common logarithm log 10,000? What is #log_10 10#? How do I work in #log_10# in Excel? See all questions in Common Logs Impact of this question 1770 views around the world You can reuse this answer Creative Commons License