Its 144. you just subtract the 121 from 265.
C and D are the same, so its between A and B, which concludes your answer should be B
Answer:
11in
Step-by-step explanation:
a^2+b^2=c^2 when c is the hypotenuse
10^2+sqrt21^2=c^2
100+21=c^2
121=c^2
11=c
31 units
the outer part,try to combines pieces that would make one unit and count