Does a triangle with side lengths of 8m, 18m, and 10m form a Right triangle?

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.

Agraph of a trapezoid can have diagonals with slopes that are negative reciprocals and two pairs of adjacent sides that are congruent, true or false, and why

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?