Protractor

Section 7.6 “Useful tools of Geometry”

Ruler

L-Square

Cardboard ATM

Notebook

Tape Measure

Tape Measure

Straight edge -A straightedge is any object that can be used to draw line segments by placing a pen orpencil against the object and tracing it alongside.

For examples:•Ruler•ID Cards•Cardboard•Edge of the Notebooks•L square•T square•Triangles•And etc.

Draw a line that is 6cm long using a ruler

Draw a ray that is 9cm long using a ruler

Compass

Compass-

A compass is a kind of tool for drawing circles.By using a compass, we can draw a circle and an arc of specified radius.

An arc is a part of the circumference of a circle

How to draw a perfect circle?

How to draw a perfect circle?

Step 1: Open the arms of the compass to the

desired length, it is best if its 3cm apart.

Step 1: Open the arms of the compass to your desired length, it is best

in 3cm.

Step 2:Fix the needle a point and rotate the other arm by a complete

revolution/turn to draw a circle.

And now you have a perfect circle!

How to draw an angle inside a circle?

Step 1: From the circle, project a line from the center to any point of the circle.

Step 2: Using the projector, find the desired degree and project a line

to the center, which is the vertex.

Central Angle

A central angle is an angle formed by two intersecting radii and the vertex in on the center of the circle.

Thank you for listening!