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Which tool can help in making a right angle in a square root spiral?

Answer and explanation

Correct answer: Set square

The direct answer is A: set square. A square root spiral is made by drawing repeated right triangles, usually adding a perpendicular side of length 1 each time. A set square has a fixed right-angle edge, so it helps the student draw a precise 90-degree angle. Step by step: place the ruler along the existing line; place the set square against it; draw the perpendicular; measure the required unit length; join the new endpoint to form the hypotenuse. Option A is correct. Option B, a balance, measures mass. Option C, a clock, measures or shows time. Option D, a measuring cylinder, measures liquid volume. None of these normally constructs a right angle. Exam cue: set square means accurate 90-degree construction.

Related tags

Number-SystemsSquare-Root-SpiralTools

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