<p>OA, I do not have the original figure, but it should like this:</p>
<p>Draw a circle. Add three radii. Now draw 3 tangents that are perpendicular to the 3 radii. The lines should cross at three points and form the triangle. Let's call those points ABC. The center of the circle could be called D. </p>
<p>Now, you can proceed by drawing the ADDITIONAL lines from the three points A, B, and C to the center D. The three triangles are ADB, BDC, and ADC. The three bases are AB, BC, and AC. The height of the 3 triangles is equal to the radius, in this case 1.</p>