Click and drag the angle α to any value between 0° and 90°. Then click and drag b and b' to make any 2 right-triangles you want with angle α.
• Look at first triangle: Divide the length of the side opposite the angle α by the length of the hypotenuse. Write this number down.
• Look at the second triangle and again divide the length of the side opposite the angle α by the length of the hypotenuse. It should be the same number!
This is the value of sin(α).
Extra check: Double-click on this worksheet to open it. Pick an angle α and find sin(α). Use the Move drawing pad tool to get an empty space on the worksheet. Then draw 2 points anywhere - not even on the same horizontal (but not too far apart). Use these 2 points to draw a right-triangle with angle α. Divide the length of the side opposite α by the length of the hypotenuse of this triangle. You should get sin(α).
to get an empty space on the worksheet. Then draw 2 points anywhere - not even on the same horizontal (but not too far apart). Use these 2 points to draw a right-triangle with angle α. Divide the length of the side opposite α by the length of the hypotenuse of this triangle. You should get sin(α).