Is c^2 - 6c +9 a perfect square?

What other information do you need to prove triangle dac=bca by asa

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

The product of sin 30 degrees and sin 60 degrees is same as the product of