Category 1 Strategies (minus constructions)

length, distance, how far

(given endpoints)

MUST KNOW BY HEART

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• 2M - E = 2(midpoint) - endpoint

slope, parallel lines

MUST KNOW BY HEART

• same slope

• flip and change the sign of the slope

• make a right angle

• turn figure upside down and it looks the same

line symmetry

MUST KNOW BY HEART

• turn upside down and it looks the same

• measure with ruler and divide by 2, make a right angle at midpoint

• fold in half and the parts match exactly

• measure with ruler and match

point symmetry

MUST KNOW BY HEART

• turn figure upside down and it looks the same

• slide the figure by adding or subtracting

• fold in half and the parts match exactly

• measure with ruler and match

90 °\degree°  counterclockwise rotation (270 °\degree°  clockwise)

FORMULA

• turn (-y,x)

• turn (-x,-y)

• turn (y,-x)

• turn (-y,-x)

270° counterclockwise rotation (90°clockwise)

FORMULA

• turn (-y,x)

• turn (-x,-y)

• turn (y,-x)

• turn (-y,-x)

slope, perpendicular lines

• same slope

• flip and change the sign of the slope

  (opposite recipricals)

• turn figure upside down and it looks the same

• measure with ruler and match

translation

• slide the figure by adding or subracting. Count the blocks. You must move right, left, up, or down.

• flip - count how far your point is to line of reflection and from that lne count the same amount in the opposite direction

• to become bigger or smaller by multiplying by scale factor

• turn (-x,-y)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

dilation

• slide the figure by adding or subtracting. Count the blocks. You must move right, left, up, or down.

• turn figure upside down and it looks the same

• flip - count how far your point is to line of reflection and from that line count the same amount in the opposite direction

• to become bigger or smaller by multiplying by scale factor

Tags

CCSS.8.G.A.3

Midpoint, halfway, intersection of diagonals AND problem asks to find midpoint

MUST KNOW BY HEART

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• 
• 2M - E = 2(midpoint) - endpoint

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