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First draw a horizontal straight line a b

Put compass point on a (open compass approximately half the length of line a b - note: ensure the compass is not altered throughout the following). Draw an arc that cuts line a b at c.

Put compass point on c and draw an arc from a to cut the first arc at d.

Draw a straight line through a d to form a 60 degree angle.

For a 120 degree angle, put compass point on dand draw an arc from a to cut the first arc at e.

Draw a straight line from a through e to give a second angle of 60 degrees: 60 + 60 = 120 degrees.

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First draw a horizontal straight line a b

Put compass point on a (open compass approximately half the length of line a b - note: ensure the compass is not altered throughout the following). Draw an arc that cuts line a b at c.

Put compass point on c and draw an arc from a to cut the first arc at d.

Draw a straight line through a d to form a 60 degree angle.

For a 120 degree angle, put compass point on dand draw an arc from a to cut the first arc at e.

Draw a straight line from a through e to give a second angle of 60 degrees: 60 + 60 = 120 degrees.

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11y ago

First draw a horizontal straight line a b

Put compass point on a (open compass approximately half the length of line a b - note: ensure the compass is not altered throughout the following). Draw an arc that cuts line a b at c.

Put compass point on c and draw an arc from a to cut the first arc at d.

Draw a straight line through a d to form a 60 degree angle.

For a 120 degree angle, put compass point on dand draw an arc from a to cut the first arc at e.

Draw a straight line from a through e to give a second angle of 60 degrees: 60 + 60 = 120 degrees.

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First draw a horizontal straight line a b

Put compass point on a (open compass approximately half the length of line a b - note: ensure the compass is not altered throughout the following). Draw an arc that cuts line a b at c.

Put compass point on c and draw an arc from a to cut the first arc at d.

Draw a straight line through a d to form a 60 degree angle.

For a 120 degree angle, put compass point on dand draw an arc from a to cut the first arc at e.

Draw a straight line from a through e to give a second angle of 60 degrees: 60 + 60 = 120 degrees.

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Q: How do you construct angle120 degrees with using a compass?
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