Triangle Congruence: ASA
Construct a triangle with a 37° angle and a 73° angle connected by a side of length 4.
1. Select the SEGMENT WITH GIVEN LENGTH 
tool, and enter a length of 4.
2. Select the LINE 
tool. Click on point A and then somewhere above segment AB.
3. Select the ANGLE 
tool. Click points C, A, and B to measure angle A. If the measurement is over 180°, undo and click on them in reverse order.
4. Select the MOVE 
tool, and move point C until angle BAC has a measure of 37°.
5. Select the LINE 
tool. Click on point B and then somewhere below segment AB.
6. Select the ANGLE 
tool. Click points D, B, and A to measure angle B. If the measurement is over 180°, undo and click on them in reverse order.
7. Select the MOVE 
tool, and move point D until angle DBA has a measure of 73°.
8. The place where the lines meet is the third vertex of your triangle. Use the INTERSECT 
tool to mark it as point E.
9. Select the DISTANCE OR LENGTH 
tool, and then click on points A and E to measure the distance between them. Do the same for points E and B.
10. Repeat this process and create another triangle with the above side lengths and angle measures.
tool, and enter a length of 4.
2. Select the LINE tool. Click on point A and then somewhere above segment AB.
3. Select the ANGLE tool. Click points C, A, and B to measure angle A. If the measurement is over 180°, undo and click on them in reverse order.
4. Select the MOVE tool, and move point C until angle BAC has a measure of 37°.
5. Select the LINE tool. Click on point B and then somewhere below segment AB.
6. Select the ANGLE tool. Click points D, B, and A to measure angle B. If the measurement is over 180°, undo and click on them in reverse order.
7. Select the MOVE tool, and move point D until angle DBA has a measure of 73°.
8. The place where the lines meet is the third vertex of your triangle. Use the INTERSECT tool to mark it as point E.
9. Select the DISTANCE OR LENGTH tool, and then click on points A and E to measure the distance between them. Do the same for points E and B.
10. Repeat this process and create another triangle with the above side lengths and angle measures.