True or false; if two planes cross one another, then their intersection is two lines.

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Pls if a cow has a mass of 9×10^2 kilograms, and a blue whale has a mass of 1.8×10^5 kilograms, which of these statements is true?