geometrical concepts

Question 1

point

Answer 1

• location represented with a dot.

- name with a capital letter e.g A

Question 2

line

Answer 2

• set of points that extend forever in two directions.
• two points define a line.
• name with two capital letters- the names of the two points that define the line e.g AB (line on the top)
• name with only one small letter e.g m (line on the top)

Question 3

line segment

Answer 3

• parts of a line that has two fixed points, starting and ending point.
• name with two capital letters-the 1st letter is the starting point and the 2nd the ending point e.g AB (line on the top)

Question 4

ray

Answer 4

• part of the line that has a fixed starting point and never ends.
• name with two capital letters-the 1st letter is the starting point e.g AB (with an arrow on the top )

Question 5

angle

Answer 5

• two rays with common starting point creat and angle
• the rays are called sides or arms of the angle
• the common starting point is called vertex of the angle
• name with 3 capital letters - the middle letter is always the vertex
• name with only 1 capital letter - the vertex
• name with only 1 small letter - the angle
• we always put this symbol ^ on the top or this one < in the beginning.

Question 6

intersecting lines

Answer 6

• lines that they have one point in common

Question 7

perpendicular lines

Answer 7

• lines that intersect on a right angle

Question 8

parallel lines

Answer 8

-lines that never intersect

Question 9

straight angle

Answer 9

• 180

Question 10

right angle

Answer 10

-90

Question 11

acute angle

Answer 11

> 90 (less than a right angle)

Question 12

obtuse angle

Answer 12

< 90 ( greater than a right angle)

Question 13

revolution angle

Answer 13

one complete turn 360

Question 14

scalene triangle

Answer 14

3 sides of different lengths

Question 15

isosceles triangle

Answer 15

two sides are equal

Question 16

equilateral triangle

Answer 16

three sides are equal

Question 17

obtuse angle triangle

Answer 17

triangle with only 1 angle to be obtuse > 90

Question 18

right angle triangle

Answer 18

triangle with only 1 angle to be right 90

Question 19

acute angle triangle

Answer 19

triangle with all of the angles to be acute <90

Question 20

angle bisector

Answer 20

A line,line segment ,ray that splits an angle into two equal angles.
(“Bisect” means to divide into two equal parts.)

Question 21

perpedicular bisector

Answer 21

A perpendicular bisector is a line,line segment,ray which intersects another line perpendicularly and divides it into two equal parts.