ANSWER:
∠1 = ∠4 (Vertically opposite angle).
∠1 = ∠5 (Corresponding angle).
∠1 = ∠8 (Alternate exterior angle).
So, ∠4 , ∠5 and ∠8 are congruent to ∠1.
I think its going to be -1/2
Hello there!
Now, the formula to find the circumference of a circle is C = 2

r. Now, since the circumference is 18

, all we have to do is to divide 18 by 2 to find the <em>radius!</em>
The radius of the circle is 9 cm, since 18/2 = 9. However, this is the radius. We need the diameter.
Multiply 9 by 2 to find the diameter. 9 · 2 = 18. So
the answer is B. 18 centimeters.
Hope this helped!
Answer:
90
Step-by-step explanation:
Length times with times height
7x+4+x=20
8x+4=20
8x+4-4=20-4
8x=16
Divide by 8 for 8x and 16
8x/8=16/8
x=2
Check answer by using substitution method
7(2)+4+2=20
14+6=20
20=20
Answer is x=2