what is the meaning of

- A
**plane surface**is one that lies evenly with the straight lines on itself. - A
**plane angle**is the inclination to each other of two lines in a plane, which meet each other and do not lie in a straight line.

**Answer :**

1 )A plane surface is one that lies evenly with the straight lines on itself.

1 )

This is the 7

^{th}definition of the Euclid's definition .

That states that as we know from the 4

^{th}definition " A straight line is a line which lies evenly with the points on itself. " that means line only have one dimension . So from " A plane surface is one that lies evenly with the straight lines on itself. " that plane is 2-dimenstion , As it lies between a straight line amd itself ( 2- dimension ) .

**2 )**A plane angle is the inclination to each other of two lines in a plane, which meet each other and do not lie in a straight line.

That is 8

^{th}definition of the Euclid's definition .

that states that if two line in a plane and form a angle than they are not a straight to each other . And angle form by can be called as plane angle .

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