Angles

A1		Construct an angle congruent to the sum of two given angles
A2		Construct an angle congruent to the difference of two given angles
A3		Given an angle A, A < 90°. Construct a 90°-A angle
A4		Construct a 45°-45°-90° triangle
A5		Construct a 30°-60°-90° triangle
A6		Construct a 18°-72°-90° triangle
A7		Construct a 36°-54°-90° triangle
A8		Construct a 36°-72°-72° triangle