a mountain climber climb down the cliff 50 feet at a time. He did this four times in one day, what was the overall change in the elevation?​

Urgent? will give brainliest given that the blue triangle is a right triangle, which expression correctly gives the area of the red square? a) a2 + b2 b) a2 - b2 c) a2 - c2 d) c2 - a2