[b]Step 1: Select the Polygon tool [/b][br]→ Click two points on one line, then one point on the other line, and click back to the first point to form a triangle.[br][br][b]Step 2: Select the Perpendicular Line tool [/b][br]→ Click the top vertex of the triangle[br]→ Then click the base line (bottom side of the triangle)[br][br][b]Step 3: Select the Point tool[/b][br]→ Click the intersection point where the perpendicular line meets the base[br]→ Make sure the point turns black (this means it is fixed correctly)[br][br][b]Step 4: Hide the extra line[/b][br]→ Right-click the perpendicular line[br]→ Uncheck “Show Object”[br][br][b]Step 5: Select the Segment tool [/b][br]→ Click the top vertex, then click the black point[br]→ This creates the height of the triangle[br][br][b]Step 6: Select the Distance or Length tool [/b][br]→ Click the base to see its length[br]→ Click the height to see its length[br][br][b]Step 7: Select the Angle tool         [/b][br]→ Click the top vertex, the black point and one point of the base [br]→ Click the angle, then click “Angle Between:”, followed by “0° to 180°