A penny has a 1 cm radius. What is its diameter? Its circumference? its area?
And your thinking is ?
To find the diameter of a penny, you need to double its radius. The radius is given as 1 cm, so doubling it gives us a diameter of 2 cm.
To find the circumference of a circle, you can use the formula C = 2πr, where C represents the circumference and r represents the radius. In this case, the radius is 1 cm. Plugging in the values, we get C = 2π(1 cm) = 2π cm.
To find the area of a circle, you can use the formula A = πr^2, where A represents the area and r represents the radius. In this case, the radius is 1 cm. Plugging in the value, we get A = π(1 cm)^2 = π cm^2.
So, the diameter of the penny is 2 cm, the circumference is 2π cm, and the area is π cm^2.