In addition to the facts in the diagram, which other statements are necessary to prove that ∆abc is congruent to ∆efg by the asa criterion?

The ASA (Angle-Side-Angle) postulate states that if two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent. (The included side is the side between the vertices of the two angles.)

From the diagram you can see that

1. .

Additionally you need:

2.

3.

Then you can use ASA Postulate to prove that

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)