Answer:
C. It has reflectional symmetry with five lines of symmetry.
Step-by-step explanation:
You take out the squares inside of the radicals. you can do this by factoring each number. 90 is a multiple of 3x3x2x5 and 40 is 2x2x2x5. now you take out pairs. so its (3√2x5)/(2√2x5). then you cancel out the √2x5 and you're left with 3/2. :)
Answer:
△DEF is rotated about point N to △D′E′F′ .
△DEF→Pre-Image ,△D′E′F′ → Image
1. D N ≅ D' N' [ true]
2.The corresponding side lengths in the image and the pre-image are not equal. [ False ]
3.All corresponding points on the image and pre-image are equidistant to point N. [ False]
4.The image is the same size and shape as the pre-image. [True]
Since the cosine is zero when the angle is an odd multiple of
, you have
.
Divide both sides by 2 and you get
600 and 60 I do not know what to do