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bombshell925
bombshell925 bombshell925
  • 18-05-2016
  • Mathematics
Answered

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Verified Answer :

apologiabiology
apologiabiology apologiabiology
  • 18-05-2016

first one
we see that since both traignels are having right angles, and same corner angle (BAC) their sides are proportional

we notice that CB=AB so therefor
ED=DA
12=12
but wait, x=AD-AB=12-2=10

x=10





circumference=2pir
2pi=2pir
divide both sides by 2pi
1=r

nice

area=pir^2
area=pi1^2
area=pi1
aera=pi

area=pi units or 3.14 unts

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