A land is in the shape of a semicircle with radius 10m. How much wire is needed to fence the plot

Suppose you are analyzing the relationship between time and distance given in a table,and there are 4 values for each quantity.you divide distance 2 minus distance 1 by time 2 minus time 1.you then divide distance 4 minus distance 3 by time 4 minus time 3 and get a different answer.what can you say about the relationship?

What is the volume if this rectangular prism: 5/2 cm by 3/4 cm by 1/3 cm

Given: △abc, bc> ac, d∈ ac , cd=cb prove: m∠abd is acute