Answer all the questions below and press submit to see how many you got right.
Addition : Addition is the mathematical operation that describes increasing a number by an amount equal to a second number. The mathematical symbol for addition is the plus sign $+.$ The term addition is also used for a generalization of this basic operation on numbers to functions, vectors and matrices.
Alternate exterior angle : When two parallel lines are crossed by a third line, alternate exterior angles are a pair of angles that are not between the two parallel lines and are on opposites sides of the crossing line. Alternate exterior angles are equal.
Alternate interior angle : When two parallel lines are crossed by a third line, alternate interior angles are a pair of angles that are between the two parallel lines and are on opposites sides of the crossing line. Alternate interior angles are equal.
Exterior angle : When looking at two parallel lines cut by a third line, exterior angles refer to angles that are not between the two parallel lines. In a polygon an exterior angle refers to the angle at a corner that lies outside the polygon.
Line : A line AB is a one-dimensional shape that includes the points A and B, all the points on the line segment in between A and B and all the points of the straight extension of the line segment beyond A and B. A line does not have an endpoint.
Parallel : Two lines in a two-dimensional plane are called parallel if they never cross.
Straight angle : A straight angle is an angle equal to $180^{\circ}.$
Third : A third either refers to the third object in an ordering or to the number $\frac{1}{3}=0.\overline{3}.$
Two parallel lines are crossed by a third line. Choose all statements that are true.
Centimeter : A centimeter ($cm$) is $\frac{1}{100}$ of a meter.
Factor : If a natural number is divisible by a second natural number, that second natural number is called a factor of the first natural number. For example the factors of 12 are 1,2,3,4,6 and 12.
Length : Length is the attribute of a one-dimensional shape that can be measured with a measuring tape.
Scale : Scale refers to the size of a shape. A scale drawing changes a shape to a similar shape of a different size.
In a scale drawing with a scale 1:40 a line is 3 cm long. What is the actual length of the line in cm?
Circle : A circle is a two-dimensional shape. The boundary of a circle is a set of points that has the same distance (the radius) from the center of the circle.
Circumference : The perimeter of a circle is called circumference. The length of the circumference $C$ can be calculated as $C=2\pi r=\pi d,$ where $r$ is the radius and $d$ the diameter of the circle. This means that the circumference of a circle with diameter 1 $cm$ (radius 0.5 $cm$) is about 3.14 $cm.$
Diameter : The diameter of a circle is the length of a line segment from the boundary of a circle through the center of the circle to the boundary on the other side of the circle.
Pi : Pi or $\pi$ is an irrational number approximately equal to 3.14 that is defined as the quotient of the circumference and the diameter of a circle.
Radius : In a circle or sphere the radius is the distance between the center and the boundary.
What is the circumference of a circle with radius 4 cm? Approximate $\pi$ by 3 in the calculation.