P+Q+R=180 then to prove (cosp/sinq. sinr) + (cosq/sinr. sinp) + (cosr/sinp. sinq)=2

What two criteria are needed for triangles to be similar

Plz.yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?

Which expression is equal to (21)(7)(3x) using the associative property? (21 · 7 · 3)x (7)(21)(3x) 32(7 + 3x) (3x)(7)(21)