What is the perimeter of a triangle with a 10 inch length and 21 inch width (on both sides)?

52 inches

Step-by-step explanation:]

Step one:

given data

Length of one side= 10inch

Width of the other two sides= 21 inches

Step two:

The perimeter of the triangle is given as

P= L+W+W

P=10+21+21

P=52 inches

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)