How to Circumscribe a Triangle With a Calculator
In your geometry classes, you will often need to circumscribe triangles into circles. With most triangles, you need to use a protractor and bisect the angles of your triangle in order to find the center point of the triangle and subsequently circumscribe a circle. But if you are working with equilateral triangles, you may simply divide the sides of the triangle in two, using your calculator, if need be, and subsequently locate the center point of the triangle, from which you may draw a circle.
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Instructions
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Measure the length of one side of your triangle using a ruler. Divide that length in two, using your calculator, then mark the center point of each of your triangle sides.
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Draw a line through the midpoint of each of the sides of your triangle, perpendicular to the sides. Find the intersections of your three midpoints. This is the center point of your triangle.
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Place the sharp point of your compass on the center point of your triangle, and place the pencil of your compass on the edge of your triangle. Rotate your pencil around the center point and draw a circle.
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