The area under a curve can be estimated by dividing it into triangles, rectangles and trapeziums. If we have a speed-time or velocity-time graph, the distance travelled can be estimated by finding the ...

Sufficient conditions are obtained for a function harmonic in the disk and continuous at a boundary point to have a level curve emanating from the boundary point into the disk. The one-sided ...

Graphs are a useful way to show different types of data. A variety of graphs, such as line, bar or pie graphs, are used to present different types of data. Graphs can be used to summarise data, ...