Question

Hey could anyone explain how to answer this kind of question? Or just solve and show what you did! Thank you!

Answer 1

Step-by-step explanation:

• 9x-3=60°{each angle of equilateral triangle is 60°}
• 9x=60+3
• x=63/9
• x=7

so,

• 9x-3
• 9×7-3
• 63-3
• 60°

hope it helps.