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### Grade 4 - Mathematics2.1 1 and 2 Dimensional Figures

 A flat surface is called a plane. Infinite number of points can be marked on a plane. A straight line that has no end points is called a line. A straight line that has one end point is called a ray. A straight line that has two end points is called a segment. When two rays meet at a common point called the vertex, an angle is formed. An angle that measures 90 degrees is called a right angle. An angle that measures less than 90 degrees is called acute angle. An angle that measures more than 90 degrees is called obtuse angle. Two lines that cross through each other are called intersecting lines. Two lines that form 90 degrees on intersection are called perpendicular lines. Two lines that do not intersect each other at any point are called parallel lines. A line segment that extends from the center of a circle to a point on the circle is called radius. A line segment that has two of the end points on the circle is called the diameter. Directions: Answer the following questions. Also draw a ray, line, segment, acute angle, obtuse angle, right angle, parallel lines, perpendicular lines, intersecting lines, circle with radius and diameter.
 Q 1: A flat surface with no end and named by three points is calledline segmentplanesquare Q 2: A part of a line between two end points is calledline segmentlineparallel lines Q 3: What do you call a name of locations on objects and in space that are named by letters?planelinepoint Q 4: A line that passes through the center of a circle and has its end points on the circle is calleddiameterpointradius Q 5: A line segment that goes from the center of a circle to any point on the circle is calledradiuscenterline ray Q 6: What do you call lines that cross and form two obtuse and two acute angles?perpendicular linesintersecting linesparallel lines Q 7: A part of a line that has one end point is calledangleendpointray Q 8: Lines that intersect and form four right angles are calledobtuse linesparallel linesperpendicular lines Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!