Question

Find the length of the missing side. If necessary, round to the nearest tenth.

side A=10
side B=19
side C=C

A. 21.5
B. 58
C. 29
D. 841

Answer 1

The correct answer would be A. 21.5 
a^2 + b^2 = c^2

so....
100 + 361 = c^2
The square root of 461 is 21.4709106 but you would round to 21.5