Other - GeoGebra

a) Construct a triangle  a s v

b) Measure each angle  a s v

c) Find the sum of these three angles  a s v

d) Move the vertices of the triangle to check the statement holds.  a s v

a) Construct a line of length $3$  a s v

b) Construct an angle of $90^{\circ}$  a s v

c) By constructing a circle of radius $4$ at the right angle, construct a line of length $4$ that is perpendicular to the line of length $3$  a s v

d) Complete the shape to form a triangle. Measure the last side  a s v

e) Confirm that the sum of the square of the two shorter sides is equal to the square of the longer side  a s v