QUESTIONS AND ANSWERS
◉ reflection across x-axis. Answer: (x,y) to (x,-y)
◉ reflection across y-axis. Answer: (x,y) to (-x,y)
◉ reflection across y=x. Answer: (x,y) to (y,x)
◉ reflection across y=-x. Answer: (x,y) to (-y,-x)
◉ dilation formula. Answer: k: scale factor
(x,y) to (kx,ky)
◉ rotation 90˚ clockwise/270˚ counter clockwise. Answer: (x,y) to
(y,-x)
◉ rotation 180˚. Answer: (x,y) to (-x,-y)
◉ rotation 270˚ clockwise/90˚ counter clockwise. Answer: (x,y) to (-
y,x)
, ◉ Triangle sum theorem. Answer: m<A+m<B+m<C=180˚
◉ Exterior angle theorem. Answer: m<1=m<3+m<4
exterior angle= the sum of 2 angles not adjacent to the exterior angle
◉ Triangle midsegment theorem. Answer: DE=1/2 AB
DE is parallel to AB
◉ right triangle formula. Answer: c^2= a^2+b^2
◉ sin. Answer: opposite / hypotenuse
◉ cos. Answer: adjacent / hypotenuse
◉ tan. Answer: opposite / adjacent
◉ 45˚ 45˚ 90˚ right triangle hypotenuse. Answer: leg √2
◉ 45˚ 45˚ 90˚ right triangle leg. Answer: hyp√2
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