Surface area of sphere equals its four radii squared multiplied by the number π. We have then: A = 4 * π * R ^ 2 Substituting: 804 = 4 * π * R ^ 2 Clearing the value of R we have: R = root (804 / (4 * π)) R = 7.99876785 cm Nearest whole number: R = 8 cm Answer: The radius of a sphere is: B. 8cm
The area of a triangle can be calculated by multiplying the triangle's base by its height, and then dividing the result by . As an algebraic expression, this would be , where is the triangle's base and is the triangle's height. In this case, we know that and . Therefore, the area of this triangle is square units. Hope this helps!