(1)

Construct a perpendicular to through $B$

Answer

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Answer

Draw a line from B through D. This line is the perpendicular to AB through B.

Steps

Step 1 ：Draw a line segment AB.

Step 2 ：Place the compass at point B, draw an arc cutting the line segment at some point (let's call it C).

Step 3 ：Without changing the compass width, draw another arc below the line segment AB.

Step 4 ：Keeping the compass at point C, draw another arc cutting the previous arc. Let's call this intersection point D.

Step 5 ：Draw a line from B through D. This line is the perpendicular to AB through B.