i. Angle made with the positive direction of
X-axis (θ) = 45°
Slope of the line (m) = tan θ
∴ m = tan 45° = 1
∴ The slope of the line is 1.
ii. Angle made with the positive direction of X-axis
(θ) = 60°
Slope of the line (m) = tan θ
∴ m = tan 60° = √3
∴ The slope of the line is √3.
iii. Angle made with the positive direction of
X-axis (θ) = 90°
Slope of the line (m) = tan θ
∴ m = tan 90°
But, the value of tan 90° is not defined.
∴ The slope of the line cannot be determined.