Answer:
r = 115°
s = 130°
t = 115°
Explanation:
1) Angles on a straight line equal 180°.
So, to find angle 'r' you must do 180° - 65° to get 115°.
2) The two dashes on the side represent that the angle equivalent to 65° is equal to the angle next to angle 't'.
So you do 180° - 65° again to get 115°, to work out angle 'r'. This means that both the exterior angles are 115°.
3) The interior angles of a triangle add up to 180°.
So you must do 65° + 65° = 130°
180° - 130° = 50°
Then to work out angle 's' do 180° - 50° = 130°.
So the final answers are:
r = 115°
s = 130°
t = 115°
(Extra information: Exterior angles always add up to 360°, so if the angles on the outside of the shape don't add up to 360°, then you might have slipped up somewhere)