How to Draw Triangles using Geometrical Instruments? - Part 3
1. Draw a triangle DEF with ∠DEF = 130°, ∠DFE = 20° and EF = 6 cm.
Step 1: Draw a straight line EF 6 cm long.
![drawing a right-angled triangle](/images/notes/drawing_triangles_regular_step1.png)
Step 2: Using a protractor draw an angle of 130° from Point E.
![drawing a right-angled triangle](/images/notes/drawing_triangles_regular_step2.png)
Step 3: Using a protractor draw an angle of 20° from Point F.
![drawing a right-angled triangle](/images/notes/drawing_triangles_regular_step3.png)
![drawing a right-angled triangle](/images/notes/drawing_triangles_regular_step3.png)
Step 4: Mark the point where the two lines meet as Point D.
![drawing a right-angled triangle](/images/notes/drawing_triangles_regular_step4.png)
Δ DEF is the required triangle.
![drawing a right-angled triangle](/images/notes/drawing_triangles_regular_step4.png)
Δ DEF is the required triangle.