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I get 9 triangle with fewer than 9 lines.
Draw a square: ABCD (4 lines)
Draw the diagonals AC, BD (2 lines) which meet at X in the centre.
On a separate part of the page, draw triangle PQR (3 lines).
That is 4 + 2 + 3 = 9 lines.
The triangles are:
ABC, BCD, CDA, DAB,
AXB, BXC, CXD, DXA,
and PQR
9 triangles with 9 lines. Could have done 13 triangles with 7 lines by drawing a line from A to BC.
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∙ 11y ago
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A line containing the point 5 9 and -5 -5 is going from the bottom left to the top right. It is a positive slope.
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A line containing the point 5 9 and -5 -5 is going from the bottom left to the top right. It is a positive slope.
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A pentagon is a shape with five corners and five equal sides. A pentagon can be divided into five equal triangles. A pentagram is a pentagon with five triangles drawn on each side, forming a star.
