A car leaves Dover at 8.00am and arrives in london at 10.30am
if the Distance
is 120km, find the average speed

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

ok thats very interesting

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.