Answer:
the formula is a²+b²=c²
the given is a=400 ft b=height of triangle c=800 ft. so, we're looking for the number of b. We will use the formula which is a is 400 multiply by itself and c is 800 multiply by itself while b is missing. 400 times 400 is 1,600 ft² and 800 multiply by itslef is equal to 640,000 ft². Move the 160,000 (reciprocate) at the inside of b². Then, we would change the sign of 160,000. then it would become a negative sign. so, we would solve 640,00 minus(because the 160,000 is negative) 160,000 equal to 480,00 ft². We will simplify it by using radical sign. cancel the both exponent which is ². divide it into the exponent and divide it again so, the answer is b=400√3 ft.
hope it helps you!
