Respuesta :

MissPhiladelphia
When the triangle is a right triangle, you can use the Pythagorean theorem. The formula would be

c^2 = a^2 + b^2

If a = 21 and c=29, thus

b^2 = c^2 - a^2
b^2 = 29^2 - 21^2
b^2 = 400
b = square root (400)
b = 20 units. 

Thus, the answer is D) B = 400
matzenkristen

Answer:

the answer is D. B = 400

Step-by-step explanation: