What is the formula for the area of a triangle?

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.

Given: △acm, m∠c=90°, cp ⊥ am , ac: cm=3: 4, mp-ap=1. find am.