Some important angles-
Straight line – At any straight line the angle makes at 180°
Vertical opposite angle – When tow lines intersect at point then they will make a cross sign so their opposite angels make equal angle those will be called vertically opposite angles.
Supplementary angle – Sum of any tow angles is equal to 180° it called supplementary angle
here sum of 130 ° and 50 °will be 180 ° so 130° and 50° are supplementary of each other.
Example – Find the supplementary angle of y. if it’s one angle is 77 °?
Solution –
y + 77° = 180°
y = 180° – 77°
y = 103° Ans.
Complementary – Sum of any tow angles is equal to 90° it called complementary angle.
here, sum 59° and 31° will be 90° so 59° and 31° are complementary of each other
example-Find the complementary angle of x. if it’s one angle is 37°
Solution-
x + 37° = 90°
x = 90° – 37°
x = 53° Ans
