That night, a thunderstorm knocked out the power. Frustrated, Rohan lit a candle and, with nothing else to do, opened his phone. The PDF glowed in the dark. He zoomed in on a random page:
“A satellite dish is a paraboloid of revolution,” it read. “Signals from space bounce off its curved surface and converge at a single point called the focus.” mastering mathematics 1b pdf
He checked the answer key. Correct.