Question

Please help me, please

Answer 1

m∠1 = 88°

m∠2 = 42°

m∠3 = 113°

Explanation:

All of the angles in a triangle add up to 180°. This knowledge can be used to find angle 3, which I will rename c to make writing an equation easier.

`180=25+42+c\\180=67+c\\113=c`

Angle 3 is 113°

Two angles on either side of the intersection of two straight lines are equal, therefore angle 2, or b:

`b=42`

Angle 2 is 42°

Now that two angles are known in the leftmost triangle, we can solve for the last one: Angle 1, or a:

`180=50+42+a\\180=92+a\\88=a`

Angle 1 is 88°