I think you use pie times diameter

Which expression gives the area of the triangle shown below

Charlie tosses five coins.what is the probability that all five coins will land tails up.

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is