Considering Cosine rule, a² + c² - b²⁄2ac is equal to
A). cos A
B). cos C
C). cos B
D). cos D
Line which is perpendicular to line passing through intersection point is called
A). normal
B). angular
C). triangular
D). trigonometrical
For any acute angle, sine A is equal to
A). sin (90° - A)
B). sin (180° - A)
C). sin (180° + A)
D). sin (2A - 180°)
If cosine is 0.8 then value of acute angle is
A). 36.87°
B). 45°
C). 47.23°
D). 52.57°
Number of dimensions a line can have is
A). zero
B). one
C). infinite
D). negative