GeoGebra - to construct isosceles triangle
Activity 4: To construct
an isosceles triangle
1. Select the tool
(Circle with Centre through a Point) and construct a circle centre A through
point B. If the labels are not showing, right click, select properties and with
the Basic tab open, click on Show Label.
2. Select the Point on
Object tool and construct any point C on the circumference of circle c.
3. Select the Segment
between Two Points tool and construct [AC]
4. Construct [BC] and
[AB].
5. Right click on one
side of the triangle, select Properties, and with the Basic tab open, click on
the drop down arrow beside the Show Label box. Select Name and Value to show
the name and length of this side of the triangle. Repeat for the other triangle
sides.
6. Drag each vertex of
triangle ABC and note the length of its sides.
7. Hide the circle, by
right clicking on it and clicking on Show Object.
8. Measure the 3 angles
in the triangle using the Angle tool.
9. Drag any of the
vertices of the triangle ABC and observe how the angle measures change.
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