Answer: 27
Step-by-step explanation:
(3x +9) is on a straight line with the right angle so we know
3x+9= 90
3x = 81
So
x = 27
Answer:
x=27
3x+9 is a right angle because 3x+9 + a right angle make a straight line
3x+9 +90 = 180
Subtract 90 from each side
3x+9 = 90
We now can solve for x
3x+9-9 = 90-9
Divide each side by 3
3x/3 = 81/3
≈ 70.4 cm
The circumference (C) of a circle is calculated as
C = 2πr ( r is the radius ) , thus
C = 2 × 3.142 × 11.2 ≈ 70.4 ( to 1 dec. place )
HAPPY:) I explained it!!
