Answer:
a = 70º
b = 70º
Step-by-step explanation:
This is known as an isosceles triangle meaning there will be one angle and then the other 2 angles will be equal.
It is a rule that the SUM OF ALL 3 ANGLES in a triangle will equal 180º. Now we also know that a and b will be equal so I will represent them both as x. I will make an equation to represent this.
[tex]x+x+40=180[/tex]
Simplify
[tex]2x+40=180[/tex]
Subtract 40 from both sides
[tex]2x=140[/tex]
Divide both sides by 2
[tex]x=70[/tex]
Both a and b will equal 70º
