Construction of Triangles - Activity 1

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Estimated Time

Prerequisites/Instructions, prior preparations, if any

Materials/ Resources needed

File:0. Triangle ABC.ggb

Process (How to do the activity)

A triangle is a three sided closed figure

Draw triangle ABC

Vertices - A, B and C

Sides – AB, BC and AC .

(AC can also be called as CA, AB as BA)

Angles - ∡abc, ∡cba ∡acb (Middle letter is the vertex of the angle. First and third letters are points on the sides of the angle)

A triangle has 3 vertices, 3 sides and 3 angles. Which of these need to be specified to draw a triangle?

Draw the altitude from vertex A to segment BC. Label the intersection as D

Measure its length. Measure ∡ADB and ∡ADC.

Measure the area of the triangle ABC

Evaluation at the end of the activity