English: A right triangle illustrates a ramp. Its vertical side is labeled "opposite = rise" and its horizontal side is labeled "adjacent = run." The angle formed by the hypotenuse and horizontal sides is labeled, using an arrow, as "ramp angle."
A pair of nested semicircles on the triangle's hypotenuse illustrates a protractor. A vertical line segment from the center of the semicircles (also touching the hypotenuse) illustrates a swingable arm used for reading angles from the protractor. The angle between this segment and the hypotenuse is labeled, using an angle, as "measured angle." At the top of the vertical segment there is a horizontal segment which is labeled, using an arrow, as "bubble level."
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