2022-23. P2 & P3. Angle construction with compass. Construcción de ángulos con compás

60º and 30º

90º, 45º and 22.5º

75º

120º

105º and 52º30'

135º

150º

Practice 2

LBM E1A

CMB E1A

Practice 3

CMB E1A

LBM E1A

2021-22 P3. Angle addition

AHG E1B

 

2016-17. Triangles: Notable lines

Triangles

• Circumcircle of a triangle and How to construct the circumcircle of a triangle
• Orthocenter of a Triangle

Isosceles triangle

Construction of an isosceles triangle with known unequal side and unequal angle.

I've been looking for an explanation in English, but I've only found it in Spanish.

Right-angled triangle

Construct the right angled triangle with known hypotenuse a and known sum of the sides b and c.

It is possible to draw a right angled triangle knowing the difference between b and c.

And some of your practices:

2016-17. Triangles: Problem solving

There are some typical geometry problems that can be easily solved using ruler (or straightedge) and compass.

Triangles

• Triangle given three sides (SSS)
• Triangle given two sides and included angle (SAS)
• Triangle given two angles and the included side (ASA)
• Circumcircle of a Triangle
• Incenter of a Triangle
• Centroid (Barycenter) of a Triangle
• Orthocenter of a Triangle 

Right triangle

• Right triangle given one leg and hypotenuse (HL)
• Right triangle given each leg (LL)
• Right triangle given one angle and one leg (LA)
• Right triangle given one angle and hypotenuse (HA)

And some of your practices:

2016-17. Basic constructions I

Some basic concepts in video.