Perpendicular lines have slopes that are negative reciprocals. example: line a has a slope of 2/3, line b has a slope if -3/2 if they are perpendicular.
Let the required number is 2x ,
According to the condition,
➡ 10 times the sum of half of 2x and 6 = 8

Therefore the value of x is -5.2
And, required number is -5.2
Step-by-step explanation:
I think B or F is the best answer
Circumference=2pir=<span>2∗3.14∗5.1</span><span>=30.028=30.03.</span>