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One way we can mark positions is on a grid. We do this by using coordinates which are placed on an X axis and a Y axis. These coordinates will usually be written like this: (3,4) (3,6) (5,6) (5,4). Those particular ones would mark out a square. The first number represents a line on the X axis and the second number a line on the Y axis. Where the two lines meet is a particular point on the grid.

1.

Which of these angles is obtuse?

90^{o}

75^{o}

150^{o}

200^{o}

2.

On a straight line, there is an angle of 72^{o}. What is the other angle?

108^{o}

208^{o}

288^{o}

98^{o}

180^{o} - 72^{o} = 108^{o}

3.

Two angles make a straight line. One is 25^{o}; what is the other?

65^{o}

335^{o}

255^{o}

155^{o}

180^{o} - 25^{o} = 155^{o}

4.

How would you find the coordinates 2,3?

Start at 0,0 move 2 to the right and 3 up

Start at 0,0 move 3 to the right and 2 up

Start at 0,0 move 2 up and 3 to the right

Start at 0,0 move 3 up and 2 to the right

The first coordinate is always along the X axis

5.

What is the name given to an angle that is more than 90^{o} and less than 180^{o}?

Acute

Obtuse

Right angle

Scalene

An obtuse angle can be thought of as the point of a blunt pencil

6.

What is the name of the vertical axis?

B

X

Y

Z

One way to remember this is that a 'Y' looks similar to a 'V' for **V**ertical

7.

On a grid, in which direction is the X axis?

Horizontal

Vertical

Diagonal

Curved

One way to remember this is the sound 'X' makes - it sounds a little bit like a**C**ro**SS** and horizontal lines travel **across** the page

8.

Which coordinates are the first on a grid?

1,1

0,0

0,1

1,0

0,0 is the place where the X axis and the Y axis cross one another

9.

What is the name given to an angle that is less than 90^{o}?

Acute

Obtuse

Right angle

Scalene

An acute angle can be thought of as the point of a sharp pencil

10.

How many degrees is a straight line?

360^{o}

90^{o}

45^{o}

180^{o}

A circle is 360^{o} and a straight line is half a circle. 180^{o} is half of 360^{o}

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^{o}is not obtuse as it is more than 180^{o}