Help me Q_Q with this question please

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

What number line represents the solution set for the inequality -1/2 greater than or equal to 4