Question

If point p lies in first octant, then the sign of x-coordinate will always be
A) +
B) -
C) x coordinate is always 0
D) x coordinate can be + or -

Answer 1

Hint: In this question it is given that if point p lies in the first octant, then we have to find the sign of x-coordinate. So to find the solution we have to know that in the first octant, the values of x,y and z axes are positive. So any point which lies in the first octant has all their coordinate values as positive.
Complete step-by-step solution:
As we know that point which lies in the first octant has all their coordinate values as positive.

So since the point p lies in the first octant, so, p will have all its coordinates as positive.
Hence, the sign of x-coordinate will always be +.
Note: So for this you have to know that octant in solid geometry is one of the eight divisions of a Euclidean three-dimensional coordinate system defined by the signs of the coordinates. It is similar to the two-dimensional quadrant and the one-dimensional ray.