Observe the figure clearly.
To Prove: KA = KC
Proof:
Consider the triangles 
KB = KB (Common side)
(each angle is of 90 degree)
(As BY bisects angle ABC)
Therefore, 
By AAS congruence Theorem which states:
"If two angles and a non-included side of one triangle are congruent to the corresponding parts of another triangle, then the triangles are congruent".
Hence, the given triangles are congruent by AAS congruence criteria.
Answer:
.3
Step-by-step explanation:
As the word suggests, a quarter-sphere is a quarter of a sphere, and thus the volume of a quarter-sphere is a quarter of the volume of the sphere.
The volume of a sphere is computed as

So, the volume of a quarter-sphere is

Yes, we can see each triangle has congruent angle, side, angle, respectively (SAD). When two triangles have these correlating congruences, they can be determined as congruent.
Answer:
the corect answer is C
Step-by-step explanation: