Definitions

Question 0

Line

Answer 0

A line is breadthless length.

Question 1

Point

Answer 1

A point is that which has no part

Question 2

Straight Line

Answer 2

A Straight Line is a line which lies evenly with the points on itself.

Question 3

Surface

Answer 3

A Surface is that which has length and and breadth only (the extremities of a surface are lines).

Question 4

Plane Surface

Answer 4

A Plane Surface is a surface which lies evenly with the straight lines on itself.

Question 5

Plane Angle

Answer 5

A Plane Angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line.

Question 6

Rectilineal

Answer 6

When lines containing an angle are straight.

Question 7

Perpendicular

Answer 7

When a straight line set up on a straight line makes the adjacent angles equal to one another, and each of the equal angles is right, the straight line standing on the other is called a perpendicular to that on which it stands.

Question 8

Obtuse Angle

Answer 8

An Obtuse Angle is an angle greater than a right angle.

Question 9

Acute Angle

Answer 9

An Acute Angle is an angle less than a right angle.

Question 10

Boundary

Answer 10

A Boundary is that which is an extremity of anything.

Question 11

Figure

Answer 11

A figure is that which is contained by any boundary or boundaries.

Question 12

Circle

Answer 12

A Circle is a plane figure contained by one line such that all the straight lines falling upon it from one point among those lying within the figure are equal to one another.

Question 13

Center of a Circle

Answer 13

Point

Question 14

Diameter of a Circle

Answer 14

Any Straight Line drawn through the center and terminated in both directions by the circumference of the circle, and also bisects a circle.

Question 15

Semicircle

Answer 15

The figure contained by the diameter and the circumference cut off by it. The center of the semicircle is the same as that of the circle.

Question 16

Rectilineal figures

Answer 16

Those figures contained by Straight Lines.

Question 17

Trilateral Figures

Answer 17

Figures contained by three Straight Lines.

Question 18

Quadrilateral Figures

Answer 18

Figures contained by four Straight Lines.

Question 19

Multilateral Figures

Answer 19

Figures contained by more than four Straight Lines.

Question 20

Equilateral Triangle

Answer 20

Trilateral trilateral figure with three equal sides.

Question 21

Isosceles Triangle

Answer 21

Trilateral figure that has two sides alone equal.

Question 22

Scalene Triangle

Answer 22

Trilateral figure which has three sides unequal.

Question 23

Right-Angled Triangle

Answer 23

Triangle which has a right angle.

Question 24

Obtuse-Angled Triangle

Answer 24

Triangle which has an obtuse angle.

Question 25

Acute-Angled Triangle

Answer 25

Triangle which has three angles acute.

Question 26

Square

Answer 26

Quadrilateral figure that which is both equilateral and right-angled.

Question 27

Oblong

Answer 27

Quadrilateral figure that which is right-angled but not equilateral.

Question 28

Rhombus

Answer 28

Quadrilateral figure that which is equilateral but not right-angled.

Question 29

Rhomboid

Answer 29

Quadrilateral figure that which has its opposite sides and angles equal to one another but is neither equilateral nor right-angled.

Question 30

Trapezia

Answer 30

Quadrilaterals that are not square, oblong, rhombus or rhomboid.

Question 31

Parallel Straight Lines

Answer 31

Straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.