Introduction to Geogebra Tools
Plot A(2,3), B(-4,6), C(0,3), D(-3,5). Then Join all the points with straight line.
Draw a circle with radius 5unit. Now draw an angle of 60 deg keeping the radius as its base.
Draw a line AB. Find its midpoint. Now draw a pentagon with sides equal to half of AB. Measure the internal angles of the pentagon.